support using duplicate checker to prevent duplicate submissions for new transaction record

pkg/duplicatechecker/duplicate_checker.go

@@ -0,0 +1,7 @@
+package duplicatechecker
+
+// DuplicateChecker is common duplicate checker interface
+type DuplicateChecker interface {
+	Get(checkerType DuplicateCheckerType, uid int64, identification string) (bool, string)
+	Set(checkerType DuplicateCheckerType, uid int64, identification string, remark string)
+}