Redo coordinator structure, connect API to node

- API:
	- Modify the constructor so that hardcoded rollup constants don't need
	  to be passed (introduce a `Config` and use `configAPI` internally)
- Common:
	- Update rollup constants with proper *big.Int when required
	- Add BidCoordinator and Slot structs used by the HistoryDB and
	  Synchronizer.
	- Add helper methods to AuctionConstants
	- AuctionVariables: Add column `DefaultSlotSetBidSlotNum` (in the SQL
	  table: `default_slot_set_bid_slot_num`), which indicates at which
	  slotNum does the `DefaultSlotSetBid` specified starts applying.
- Config:
	- Move coordinator exclusive configuration from the node config to the
	  coordinator config
- Coordinator:
	- Reorganize the code towards having the goroutines started and stopped
	  from the coordinator itself instead of the node.
	- Remove all stop and stopped channels, and use context.Context and
	  sync.WaitGroup instead.
	- Remove BatchInfo setters and assing variables directly
	- In ServerProof and ServerProofPool use context instead stop channel.
	- Use message passing to notify the coordinator about sync updates and
	  reorgs
	- Introduce the Pipeline, which can be started and stopped by the
	  Coordinator
	- Introduce the TxManager, which manages ethereum transactions (the
	  TxManager is also in charge of making the forge call to the rollup
	  smart contract).  The TxManager keeps ethereum transactions and:
	  	1. Waits for the transaction to be accepted
		2. Waits for the transaction to be confirmed for N blocks
	- In forge logic, first prepare a batch and then wait for an available
	  server proof to have all work ready once the proof server is ready.
	- Remove the `isForgeSequence` method which was querying the smart
	  contract, and instead use notifications sent by the Synchronizer to
	  figure out if it's forging time.
	- Update test (which is a minimal test to manually see if the
	  coordinator starts)
- HistoryDB:
	- Add method to get the number of batches in a slot (used to detect when
	  a slot has passed the bid winner forging deadline)
	- Add method to get the best bid and associated coordinator of a slot
	  (used to detect the forgerAddress that can forge the slot)
- General:
	- Rename some instances of `currentBlock` to `lastBlock` to be more
	  clear.
- Node:
	- Connect the API to the node and call the methods to update cached
	  state when the sync advances blocks.
	- Call methods to update Coordinator state when the sync advances blocks
	  and finds reorgs.
- Synchronizer:
	- Add Auction field in the Stats, which contain the current slot with
	  info about highest bidder and other related info required to know who
	  can forge in the current block.
	- Better organization of cached state:
		- On Sync, update the internal cached state
		- On Init or Reorg, load the state from HistoryDB into the
		  internal cached state.

eth/auction_test.go

@@ -71,7 +71,7 @@ func TestAuctionSetSlotDeadline(t *testing.T) {
 	slotDeadline, err := auctionClientTest.AuctionGetSlotDeadline()
 	require.Nil(t, err)
 	assert.Equal(t, newSlotDeadline, slotDeadline)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newSlotDeadline, auctionEvents.NewSlotDeadline[0].NewSlotDeadline)
 }
@@ -90,7 +90,7 @@ func TestAuctionSetOpenAuctionSlots(t *testing.T) {
 	openAuctionSlots, err := auctionClientTest.AuctionGetOpenAuctionSlots()
 	require.Nil(t, err)
 	assert.Equal(t, newOpenAuctionSlots, openAuctionSlots)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newOpenAuctionSlots, auctionEvents.NewOpenAuctionSlots[0].NewOpenAuctionSlots)
 }
@@ -109,7 +109,7 @@ func TestAuctionSetClosedAuctionSlots(t *testing.T) {
 	closedAuctionSlots, err := auctionClientTest.AuctionGetClosedAuctionSlots()
 	require.Nil(t, err)
 	assert.Equal(t, newClosedAuctionSlots, closedAuctionSlots)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newClosedAuctionSlots, auctionEvents.NewClosedAuctionSlots[0].NewClosedAuctionSlots)
 	_, err = auctionClientTest.AuctionSetClosedAuctionSlots(closedAuctionSlots)
@@ -130,7 +130,7 @@ func TestAuctionSetOutbidding(t *testing.T) {
 	outbidding, err := auctionClientTest.AuctionGetOutbidding()
 	require.Nil(t, err)
 	assert.Equal(t, newOutbidding, outbidding)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newOutbidding, auctionEvents.NewOutbidding[0].NewOutbidding)
 	_, err = auctionClientTest.AuctionSetOutbidding(outbiddingConst)
@@ -151,7 +151,7 @@ func TestAuctionSetAllocationRatio(t *testing.T) {
 	allocationRatio, err := auctionClientTest.AuctionGetAllocationRatio()
 	require.Nil(t, err)
 	assert.Equal(t, newAllocationRatio, allocationRatio)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newAllocationRatio, auctionEvents.NewAllocationRatio[0].NewAllocationRatio)
 	_, err = auctionClientTest.AuctionSetAllocationRatio(allocationRatioConst)
@@ -178,7 +178,7 @@ func TestAuctionSetDonationAddress(t *testing.T) {
 	donationAddress, err := auctionClientTest.AuctionGetDonationAddress()
 	require.Nil(t, err)
 	assert.Equal(t, &newDonationAddress, donationAddress)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newDonationAddress, auctionEvents.NewDonationAddress[0].NewDonationAddress)
 	_, err = auctionClientTest.AuctionSetDonationAddress(donationAddressConst)
@@ -193,7 +193,7 @@ func TestAuctionSetBootCoordinator(t *testing.T) {
 	bootCoordinator, err := auctionClientTest.AuctionGetBootCoordinator()
 	require.Nil(t, err)
 	assert.Equal(t, &newBootCoordinator, bootCoordinator)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newBootCoordinator, auctionEvents.NewBootCoordinator[0].NewBootCoordinator)
 	_, err = auctionClientTest.AuctionSetBootCoordinator(bootCoordinatorAddressConst)
@@ -227,7 +227,7 @@ func TestAuctionChangeDefaultSlotSetBid(t *testing.T) {
 	minBid, err := auctionClientTest.AuctionGetDefaultSlotSetBid(set)
 	require.Nil(t, err)
 	assert.Equal(t, minBid, newInitialMinBid)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, slotSet, auctionEvents.NewDefaultSlotSetBid[0].SlotSet)
 	assert.Equal(t, newInitialMinBid, auctionEvents.NewDefaultSlotSetBid[0].NewInitialMinBid)
@@ -251,7 +251,7 @@ func TestAuctionRegisterCoordinator(t *testing.T) {
 
 	_, err := auctionClientTest.AuctionSetCoordinator(forgerAddress, URL)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, forgerAddress, auctionEvents.SetCoordinator[0].ForgerAddress)
 	assert.Equal(t, bidderAddress, auctionEvents.SetCoordinator[0].BidderAddress)
@@ -268,7 +268,7 @@ func TestAuctionBid(t *testing.T) {
 	bidderAddress := governanceAddressConst
 	_, err = auctionClientTest.AuctionBid(amount, currentSlot+4, bidAmount, deadline)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, bidAmount, auctionEvents.NewBid[0].BidAmount)
 	assert.Equal(t, bidderAddress, auctionEvents.NewBid[0].Bidder)
@@ -306,7 +306,7 @@ func TestAuctionMultiBid(t *testing.T) {
 	bidderAddress := governanceAddressConst
 	_, err = auctionClientTest.AuctionMultiBid(budget, currentSlot+4, currentSlot+10, slotSet, maxBid, minBid, deadline)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, bidderAddress, auctionEvents.NewBid[0].Bidder)
 	assert.Equal(t, currentSlot+4, auctionEvents.NewBid[0].Slot)
@@ -334,7 +334,7 @@ func TestAuctionClaimHEZ(t *testing.T) {
 
 	_, err := auctionClientTest.AuctionClaimHEZ()
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, amount, auctionEvents.HEZClaimed[0].Amount)
 	assert.Equal(t, governanceAddressConst, auctionEvents.HEZClaimed[0].Owner)
@@ -345,10 +345,10 @@ func TestAuctionForge(t *testing.T) {
 	require.Nil(t, err)
 	slotConst := 4
 	blockNum := int64(int(blocksPerSlot)*slotConst + int(genesisBlock))
-	currentBlockNum, _ := auctionClientTestHermez.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTestHermez.client.EthLastBlock()
 	blocksToAdd := blockNum - currentBlockNum
 	addBlocks(blocksToAdd, ethClientDialURL)
-	currentBlockNum, _ = auctionClientTestHermez.client.EthCurrentBlock()
+	currentBlockNum, _ = auctionClientTestHermez.client.EthLastBlock()
 	assert.Equal(t, currentBlockNum, blockNum)
 	_, err = auctionClientTestHermez.AuctionForge(governanceAddressConst)
 	require.Nil(t, err)