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.

coordinator/batch.go

@@ -3,59 +3,34 @@ package coordinator
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/hermez-node/eth"
 )
 
 // Proof TBD this type will be received from the proof server
 type Proof struct {
 }
 
+// TxStatus is used to mark the status of an ethereum transaction
+type TxStatus string
+
+const (
+	// TxStatusPending marks the Tx as Pending
+	TxStatusPending TxStatus = "pending"
+	// TxStatusSent marks the Tx as Sent
+	TxStatusSent TxStatus = "sent"
+)
+
 // BatchInfo contans the Batch information
 type BatchInfo struct {
-	batchNum       common.BatchNum
-	serverProof    ServerProofInterface
-	zkInputs       *common.ZKInputs
-	proof          *Proof
+	BatchNum       common.BatchNum
+	ServerProof    ServerProofInterface
+	ZKInputs       *common.ZKInputs
+	Proof          *Proof
 	L1UserTxsExtra []common.L1Tx
 	L1OperatorTxs  []common.L1Tx
 	L2Txs          []common.PoolL2Tx
+	ForgeBatchArgs *eth.RollupForgeBatchArgs
 	// FeesInfo
-	ethTx *types.Transaction
-}
-
-// NewBatchInfo creates a new BatchInfo with the given batchNum &
-// ServerProof
-func NewBatchInfo(batchNum common.BatchNum, serverProof ServerProofInterface) BatchInfo {
-	return BatchInfo{
-		batchNum:    batchNum,
-		serverProof: serverProof,
-	}
-}
-
-// SetTxsInfo sets the l1UserTxs, l1OperatorTxs and l2Txs to the BatchInfo data
-// structure
-func (bi *BatchInfo) SetTxsInfo(l1UserTxsExtra, l1OperatorTxs []common.L1Tx, l2Txs []common.PoolL2Tx) {
-	// TBD parameter: feesInfo
-	bi.L1UserTxsExtra = l1UserTxsExtra
-	bi.L1OperatorTxs = l1OperatorTxs
-	bi.L2Txs = l2Txs
-}
-
-// SetZKInputs sets the ZKInputs to the BatchInfo data structure
-func (bi *BatchInfo) SetZKInputs(zkInputs *common.ZKInputs) {
-	bi.zkInputs = zkInputs
-}
-
-// SetServerProof sets the ServerProof to the BatchInfo data structure
-func (bi *BatchInfo) SetServerProof(serverProof ServerProofInterface) {
-	bi.serverProof = serverProof
-}
-
-// SetProof sets the Proof to the BatchInfo data structure
-func (bi *BatchInfo) SetProof(proof *Proof) {
-	bi.proof = proof
-}
-
-// SetEthTx sets the ethTx to the BatchInfo data structure
-func (bi *BatchInfo) SetEthTx(ethTx *types.Transaction) {
-	bi.ethTx = ethTx
+	TxStatus TxStatus
+	EthTx    *types.Transaction
 }