feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/pkg/lang/crypto/md5.go

@@ -0,0 +1,11 @@
+package crypto
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+)
+
+func MD5HexValue(input string) string {
+	md5Hash := md5.Sum([]byte(input))
+	return hex.EncodeToString(md5Hash[:])
+}