[ISSUE-#4251]Add batch flag

[dongeforever]

Make sure set the target branch to develop

What is the purpose of the change

fix ISSUE #4251

Brief changelog

add two sys flag in MessageSysFlag

Verifying this change

Follow this checklist to help us incorporate your contribution quickly and easily. Notice, it would be helpful if you could finish the following 5 checklist(the last one is not necessary)before request the community to review your PR.

• Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test(over 80% coverage) to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle to make sure basic checks pass. Run mvn clean install -DskipITs to make sure unit-test pass. Run mvn clean test-compile failsafe:integration-test to make sure integration-test pass.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

[coveralls]

Coverage increased (+0.06%) to 52.231% when pulling 69647cd on dongeforever:add_batch_flag into 7043211 on apache:develop.

[codecov-commenter]

Codecov Report

Merging #4252 (69647cd) into develop (7043211) will increase coverage by 0.09%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #4252      +/-   ##
=============================================
+ Coverage      48.10%   48.19%   +0.09%     
- Complexity      5073     5084      +11     
=============================================
  Files            642      642              
  Lines          42789    42789              
  Branches        5601     5601              
=============================================
+ Hits           20582    20621      +39     
+ Misses         19688    19663      -25     
+ Partials        2519     2505      -14     

Impacted Files	Coverage Δ
...apache/rocketmq/common/sysflag/MessageSysFlag.java	20.00% <ø> (ø)
...ketmq/common/protocol/body/RegisterBrokerBody.java	84.78% <0.00%> (-1.09%)	⬇️
...main/java/org/apache/rocketmq/store/CommitLog.java	75.08% <0.00%> (+0.11%)	⬆️
...ain/java/org/apache/rocketmq/store/MappedFile.java	51.40% <0.00%> (+0.35%)	⬆️
...n/java/org/apache/rocketmq/store/ha/HAService.java	71.85% <0.00%> (+0.66%)	⬆️
...va/org/apache/rocketmq/common/stats/StatsItem.java	50.83% <0.00%> (+0.83%)	⬆️
...che/rocketmq/namesrv/kvconfig/KVConfigManager.java	60.20% <0.00%> (+1.02%)	⬆️
.../apache/rocketmq/logging/inner/LoggingBuilder.java	65.34% <0.00%> (+1.42%)	⬆️
...he/rocketmq/client/trace/AsyncTraceDispatcher.java	84.39% <0.00%> (+1.46%)	⬆️
...a/org/apache/rocketmq/store/StoreStatsService.java	37.53% <0.00%> (+1.68%)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7043211...69647cd. Read the comment docs.