[ISSUE-#4251]Add batch flag (#4252)

* Add it test holder for manual test

* Add it test holder for manual test

* Polish the test, remove useless code

* Polish the test, remove useless code

* Mark the flag for batch to avoid conflict

Author: dongeforever

common/src/main/java/org/apache/rocketmq/common/sysflag/MessageSysFlag.java

@@ -39,6 +39,9 @@ public class MessageSysFlag {
     public final static int TRANSACTION_ROLLBACK_TYPE = 0x3 << 2;
     public final static int BORNHOST_V6_FLAG = 0x1 << 4;
     public final static int STOREHOSTADDRESS_V6_FLAG = 0x1 << 5;
+    //Mark the flag for batch to avoid conflict
+    public final static int NEED_UNWRAP_FLAG = 0x1 << 6;
+    public final static int INNER_BATCH_FLAG = 0x1 << 7;
 
     // COMPRESSION_TYPE
     public final static int COMPRESSION_LZ4_TYPE = 0x1 << 8;