[ISSUE #290]🎨Optimize RocketmqDefaultClient code

[mxsm]

Which Issue(s) This PR Fixes(Closes)

Fixes #290

Brief Description

How Did You Test This Change?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 18.51%. Comparing base (f866ec1) to head (e979dbf).

Files	Patch %	Lines
...etmq-remoting/src/clients/rocketmq_default_impl.rs	0.00%	10 Missing ⚠️
rocketmq-broker/src/out_api/broker_outer_api.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   18.45%   18.51%   +0.06%     
==========================================
  Files         164      164              
  Lines        8661     8629      -32     
==========================================
  Hits         1598     1598              
+ Misses       7063     7031      -32     

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