feat: speed up run time constructed method handlers

[bdraco]

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (0e57d79) 83.53% compared to head (9fc8c51) 83.39%.
Report is 1 commits behind head on main.

❗ Current head 9fc8c51 differs from pull request most recent head dbbc6b3. Consider uploading reports for the commit dbbc6b3 to get more accurate results

Files	Patch %	Lines
src/dbus_fast/message_bus.py	90.00%	0 Missing and 2 partials ⚠️
src/dbus_fast/service.py	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   83.53%   83.39%   -0.15%     
==========================================
  Files          28       28              
  Lines        3286     3288       +2     
  Branches      679      682       +3     
==========================================
- Hits         2745     2742       -3     
- Misses        329      334       +5     
  Partials      212      212              

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