feat: add a cython pxd for services

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 82.30% // Head: 82.17% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (08b8ad1) compared to base (24faa00).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
- Coverage   82.30%   82.17%   -0.13%     
==========================================
  Files          27       27              
  Lines        3148     3148              
  Branches      650      650              
==========================================
- Hits         2591     2587       -4     
- Misses        342      343       +1     
- Partials      215      218       +3     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/message_bus.py	71.37% <100.00%> (-0.74%)	⬇️

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