Initial dract of the common structs

common/l2tx.go

@@ -0,0 +1,12 @@
+package common
+
+import (
+	"time"
+)
+
+// L2Tx is a struct that represents an already forged L2 tx
+type L2Tx struct {
+	Tx
+	Forged   time.Time // time when received by the tx pool
+	BatchNum BatchNum  // Batch in which the tx was forged, 0 means not forged
+}