[ISSUE #9111] Support export broker RocksDB Config to json file

[qianye1001]

Which Issue(s) This PR Fixes

Fixes #9111

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.06030% with 175 lines in your changes missing coverage. Please review.

Project coverage is 47.89%. Comparing base (0548593) to head (03436fa).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/command/metadata/RocksDBConfigToJsonCommand.java	0.00%	112 Missing ⚠️
...ocketmq/broker/processor/AdminBrokerProcessor.java	3.22%	30 Missing ⚠️
...header/ExportRocksDBConfigToJsonRequestHeader.java	70.96%	8 Missing and 1 partial ⚠️
...g/apache/rocketmq/client/impl/MQClientAPIImpl.java	0.00%	8 Missing ⚠️
...broker/config/v1/RocksDBConsumerOffsetManager.java	16.66%	5 Missing ⚠️
...ker/config/v1/RocksDBSubscriptionGroupManager.java	0.00%	3 Missing ⚠️
...mq/broker/config/v1/RocksDBTopicConfigManager.java	0.00%	3 Missing ⚠️
...apache/rocketmq/tools/admin/DefaultMQAdminExt.java	0.00%	2 Missing ⚠️
...he/rocketmq/tools/admin/DefaultMQAdminExtImpl.java	0.00%	2 Missing ⚠️
...command/export/ExportMetadataInRocksDBCommand.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9114      +/-   ##
=============================================
- Coverage      47.94%   47.89%   -0.05%     
- Complexity     12037    12045       +8     
=============================================
  Files           1320     1321       +1     
  Lines          92827    93021     +194     
  Branches       11897    11925      +28     
=============================================
+ Hits           44507    44557      +50     
- Misses         42809    42949     +140     
- Partials        5511     5515       +4     

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[RongtongJin]

I think we can remove the ExportMetadataInRocksDBCommand, as this command duplicates the functionality of RocksDBConfigToJsonCommand command.

[lollipopjin]

LGTM