Update coordinator, call all api update functions

- Common:
	- Rename Block.EthBlockNum to Block.Num to avoid unneeded repetition
- API:
	- Add UpdateNetworkInfoBlock to update just block information, to be
	  used when the node is not yet synchronized
- Node:
	- Call API.UpdateMetrics and UpdateRecommendedFee in a loop, with
	  configurable time intervals
- Synchronizer:
	- When mapping events by TxHash, use an array to support the possibility
	  of multiple calls of the same function happening in the same
	  transaction (for example, a smart contract in a single transaction
	  could call withdraw with delay twice, which would generate 2 withdraw
	  events, and 2 deposit events).
	- In Stats, keep entire LastBlock instead of just the blockNum
	- In Stats, add lastL1BatchBlock
	- Test Stats and SCVars
- Coordinator:
	- Enable writing the BatchInfo in every step of the pipeline to disk
	  (with JSON text files) for debugging purposes.
	- Move the Pipeline functionality from the Coordinator to its own struct
	  (Pipeline)
	- Implement shouldL1lL2Batch
	- In TxManager, implement logic to perform several attempts when doing
	  ethereum node RPC calls before considering the error. (Both for calls
	  to forgeBatch and transaction receipt)
	- In TxManager, reorganize the flow and note the specific points in
	  which actions are made when err != nil
- HistoryDB:
	- Implement GetLastL1BatchBlockNum: returns the blockNum of the latest
	  forged l1Batch, to help the coordinator decide when to forge an
	  L1Batch.
- EthereumClient and test.Client:
	- Update EthBlockByNumber to return the last block when the passed
	  number is -1.

api/api_test.go

@@ -412,7 +412,7 @@ func TestMain(m *testing.M) {
 		bids:             testBids,
 		slots: api.genTestSlots(
 			20,
-			commonBlocks[len(commonBlocks)-1].EthBlockNum,
+			commonBlocks[len(commonBlocks)-1].Num,
 			testBids,
 			auctionVars,
 		),
@@ -611,7 +611,7 @@ func doBadReq(method, path string, reqBody io.Reader, expectedResponseCode int)
 
 func getTimestamp(blockNum int64, blocks []common.Block) time.Time {
 	for i := 0; i < len(blocks); i++ {
-		if blocks[i].EthBlockNum == blockNum {
+		if blocks[i].Num == blockNum {
 			return blocks[i].Timestamp
 		}
 	}
@@ -647,7 +647,7 @@ func getAccountByIdx(idx common.Idx, accs []common.Account) *common.Account {
 
 func getBlockByNum(ethBlockNum int64, blocks []common.Block) common.Block {
 	for _, b := range blocks {
-		if b.EthBlockNum == ethBlockNum {
+		if b.Num == ethBlockNum {
 			return b
 		}
 	}