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.

db/historydb/historydb.go

@@ -304,6 +304,15 @@ func (hdb *HistoryDB) GetLastBatchNum() (common.BatchNum, error) {
 	return batchNum, row.Scan(&batchNum)
 }
 
+// GetLastL1BatchBlockNum returns the blockNum of the latest forged l1Batch
+func (hdb *HistoryDB) GetLastL1BatchBlockNum() (int64, error) {
+	row := hdb.db.QueryRow(`SELECT eth_block_num FROM batch
+		WHERE forge_l1_txs_num IS NOT NULL
+		ORDER BY batch_num DESC LIMIT 1;`)
+	var blockNum int64
+	return blockNum, row.Scan(&blockNum)
+}
+
 // GetLastL1TxsNum returns the greatest ForgeL1TxsNum in the DB from forged
 // batches.  If there's no batch in the DB (nil, nil) is returned.
 func (hdb *HistoryDB) GetLastL1TxsNum() (*int64, error) {
@@ -1410,7 +1419,7 @@ func (hdb *HistoryDB) AddBlockSCData(blockData *common.BlockData) (err error) {
 		}
 	}
 
-	if err := hdb.updateExitTree(txn, blockData.Block.EthBlockNum,
+	if err := hdb.updateExitTree(txn, blockData.Block.Num,
 		blockData.Rollup.Withdrawals, blockData.WDelayer.Withdrawals); err != nil {
 		return err
 	}