feat: support extra connection

[wangl-cc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 65.07%. Comparing base (4ff5cae) to head (c773cb4).

Files with missing lines	Patch %	Lines
maa-sys/src/lib.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #329      +/-   ##
==========================================
- Coverage   65.18%   65.07%   -0.11%     
==========================================
  Files          44       44              
  Lines        3553     3559       +6     
==========================================
  Hits         2316     2316              
- Misses       1237     1243       +6     

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