[ISSUE #407]🧑‍💻Optimize ConfigManager code

[mxsm]

Which Issue(s) This PR Fixes(Closes)

Fixes #407

Brief Description

How Did You Test This Change?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 19.10%. Comparing base (df27f4e) to head (4d5fb17).

Files	Patch %	Lines
rocketmq-common/src/common/config_manager.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #408      +/-   ##
==========================================
- Coverage   19.10%   19.10%   -0.01%     
==========================================
  Files         207      207              
  Lines       13827    13828       +1     
==========================================
  Hits         2642     2642              
- Misses      11185    11186       +1     

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