Extend ethclient test, implement new TxID spec

- Implement new TxID spec that distinguishes L1UserTx and L1CoordinatorTx
- Replace some type []*Foo by []Foo
- Fix HistoryDB & L2DB bug: in case of error, a rollback was applied and the returned error was nil
- Reorder inserts in historydb.NewHistoryDB() to follow foreign key dependencies
- Add initial synchronizer test with test.Client (for now, only tested l1UserTxs, blocks, addToken)
- Update L1UserTx event in test.Client

coordinator/batch.go

@@ -15,9 +15,9 @@ type BatchInfo struct {
 	serverProof    ServerProofInterface
 	zkInputs       *common.ZKInputs
 	proof          *Proof
-	L1UserTxsExtra []*common.L1Tx
-	L1OperatorTxs  []*common.L1Tx
-	L2Txs          []*common.PoolL2Tx
+	L1UserTxsExtra []common.L1Tx
+	L1OperatorTxs  []common.L1Tx
+	L2Txs          []common.PoolL2Tx
 	// FeesInfo
 	ethTx *types.Transaction
 }
@@ -33,7 +33,7 @@ func NewBatchInfo(batchNum common.BatchNum, serverProof ServerProofInterface) Ba
 
 // SetTxsInfo sets the l1UserTxs, l1OperatorTxs and l2Txs to the BatchInfo data
 // structure
-func (bi *BatchInfo) SetTxsInfo(l1UserTxsExtra, l1OperatorTxs []*common.L1Tx, l2Txs []*common.PoolL2Tx) {
+func (bi *BatchInfo) SetTxsInfo(l1UserTxsExtra, l1OperatorTxs []common.L1Tx, l2Txs []common.PoolL2Tx) {
 	// TBD parameter: feesInfo
 	bi.L1UserTxsExtra = l1UserTxsExtra
 	bi.L1OperatorTxs = l1OperatorTxs