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.

test/ethclient_test.go

@@ -46,7 +46,7 @@ func TestClientEth(t *testing.T) {
 
 	block, err := c.EthBlockByNumber(context.TODO(), 0)
 	require.Nil(t, err)
-	assert.Equal(t, int64(0), block.EthBlockNum)
+	assert.Equal(t, int64(0), block.Num)
 	assert.Equal(t, time.Unix(0, 0), block.Timestamp)
 	assert.Equal(t, "0x0000000000000000000000000000000000000000000000000000000000000000", block.Hash.Hex())
 
@@ -60,7 +60,7 @@ func TestClientEth(t *testing.T) {
 
 	block, err = c.EthBlockByNumber(context.TODO(), 2)
 	require.Nil(t, err)
-	assert.Equal(t, int64(2), block.EthBlockNum)
+	assert.Equal(t, int64(2), block.Num)
 	assert.Equal(t, time.Unix(2, 0), block.Timestamp)
 
 	// Add a token