feat: reduce duplicate code in aio MessageBus

[bdraco]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6d7f522) 83.28% compared to head (fcf7fc1) 83.44%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/dbus_fast/__version__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   83.28%   83.44%   +0.15%     
==========================================
  Files          28       28              
  Lines        3291     3279      -12     
  Branches      681      677       -4     
==========================================
- Hits         2741     2736       -5     
+ Misses        335      332       -3     
+ Partials      215      211       -4     

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