feat: add additional pxd defs for message

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 81.22% // Head: 81.49% // Increases project coverage by +0.26% 🎉

Coverage data is based on head (f3fbcf0) compared to base (3c164a9).
Patch coverage: 90.90% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   81.22%   81.49%   +0.26%     
==========================================
  Files          27       27              
  Lines        3015     3015              
  Branches      582      582              
==========================================
+ Hits         2449     2457       +8     
+ Misses        350      345       -5     
+ Partials      216      213       -3     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/aio/proxy_object.py	96.49% <100.00%> (ø)
src/dbus_fast/message.py	95.45% <100.00%> (ø)
src/dbus_fast/proxy_object.py	78.52% <0.00%> (+2.01%)	⬆️
src/dbus_fast/glib/message_bus.py	83.19% <0.00%> (+2.04%)	⬆️

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[bdraco]

Tested in production 👍