Advance coordinator implementation

- Common
	- Move ErrTODO and ErrDone to common for usage where needed.
- Coordinator
	- Move prover types to prover package
	- Handle reorgs, stopping the pipeline when necessary
	- Handle ethereum transaction errors by stopping the pipeline
	- In case of ethereum transaction revert, check for known revert causes
	  (more revert causes can be added to handle more cases)
	- Fix skipped transactions in TxManager confirmation logic
	- Cancel and wait for provers to be ready
	- Connect L2DB to:
		- purge l2txs due to timeout
		- mark l2txs at the different states
	- Connect HistoryDB to query L1UserTxs to forge in an L1Batch
- L2DB
	- Skip update functions when the input slices have no values (to avoid a
	  query with no values that results in an SQL error)
- StateDB
	- In LocalStateDB, fix Reset when mt == nil
- Prover (new package)
	- Rename the interface to Prover
	- Rename the mock struct to Mock
	- Extend Prover interface methods to provide everything required by the
	  coordinator
	- Begin implementing required http client code to interact with server
	  proof (not tested)
- Synchronizer:
	- Add LastForgeL1TxsNum to Stats
- Test/Client
	- Update Auction logic to track slots in which there's no forge during
	  the time before the deadline (following the solidity implementation)

coordinator/batch.go

@@ -9,13 +9,10 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/hermez-node/eth"
+	"github.com/hermeznetwork/hermez-node/prover"
 	"github.com/hermeznetwork/tracerr"
 )
 
-// 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
 
@@ -29,11 +26,11 @@ const (
 // BatchInfo contans the Batch information
 type BatchInfo struct {
 	BatchNum       common.BatchNum
-	ServerProof    ServerProofInterface
+	ServerProof    prover.Client
 	ZKInputs       *common.ZKInputs
-	Proof          *Proof
+	Proof          *prover.Proof
 	L1UserTxsExtra []common.L1Tx
-	L1OperatorTxs  []common.L1Tx
+	L1CoordTxs     []common.L1Tx
 	L2Txs          []common.PoolL2Tx
 	ForgeBatchArgs *eth.RollupForgeBatchArgs
 	// FeesInfo