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.

common/block.go

@@ -9,10 +9,10 @@ import (
 
 // Block represents of an Ethereum block
 type Block struct {
-	EthBlockNum int64          `meddler:"eth_block_num"`
-	Timestamp   time.Time      `meddler:"timestamp,utctime"`
-	Hash        ethCommon.Hash `meddler:"hash"`
-	ParentHash  ethCommon.Hash `meddler:"-"`
+	Num        int64          `meddler:"eth_block_num"`
+	Timestamp  time.Time      `meddler:"timestamp,utctime"`
+	Hash       ethCommon.Hash `meddler:"hash"`
+	ParentHash ethCommon.Hash `meddler:"-" json:"-"`
 }
 
 // RollupData contains information returned by the Rollup smart contract
@@ -63,9 +63,10 @@ type WDelayerTransfer struct {
 
 // WDelayerData contains information returned by the WDelayer smart contract
 type WDelayerData struct {
-	Vars             *WDelayerVariables
-	Deposits         []WDelayerTransfer
-	DepositsByTxHash map[ethCommon.Hash]*WDelayerTransfer
+	Vars     *WDelayerVariables
+	Deposits []WDelayerTransfer
+	// We use an array because there can be multiple deposits in a single eth transaction
+	DepositsByTxHash map[ethCommon.Hash][]*WDelayerTransfer
 	Withdrawals      []WDelayerTransfer
 }
 
@@ -74,7 +75,7 @@ func NewWDelayerData() WDelayerData {
 	return WDelayerData{
 		Vars:             nil,
 		Deposits:         make([]WDelayerTransfer, 0),
-		DepositsByTxHash: make(map[ethCommon.Hash]*WDelayerTransfer),
+		DepositsByTxHash: make(map[ethCommon.Hash][]*WDelayerTransfer),
 		Withdrawals:      make([]WDelayerTransfer, 0),
 	}
 }