test: added config test case for ServerConfig

[Parizval]

Which Issue(s) This PR Fixes(Closes)

Fixes #3945
Fix #3832

Brief Description

How Did You Test This Change?

[rocketmq-rust-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.48%. Comparing base (d779ced) to head (a0b9fe0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4066      +/-   ##
==========================================
+ Coverage   26.47%   26.48%   +0.01%     
==========================================
  Files         574      574              
  Lines       81191    81195       +4     
==========================================
+ Hits        21496    21507      +11     
+ Misses      59695    59688       -7     

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[rocketmq-rust-bot]

LGTM