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

db/utils.go

@@ -40,7 +40,7 @@ func InitSQLDB(port int, host, user, password, name string) (*sqlx.DB, error) {
 	if err != nil {
 		return nil, err
 	}
-	log.Info("successfully runt ", nMigrations, " migrations")
+	log.Info("successfully ran ", nMigrations, " migrations")
 	return db, nil
 }