feat: refactor message_reader to avoid python wrappers

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 81.99% // Head: 82.21% // Increases project coverage by +0.21% 🎉

Coverage data is based on head (3136c18) compared to base (6418ed4).
Patch coverage: 90.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   81.99%   82.21%   +0.21%     
==========================================
  Files          27       27              
  Lines        3104     3103       -1     
  Branches      642      641       -1     
==========================================
+ Hits         2545     2551       +6     
+ Misses        343      340       -3     
+ Partials      216      212       -4     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/aio/message_bus.py	85.78% <ø> (-0.40%)	⬇️
src/dbus_fast/_private/unmarshaller.py	95.33% <100.00%> (+0.05%)	⬆️
src/dbus_fast/aio/message_reader.py	91.30% <100.00%> (+0.39%)	⬆️
src/dbus_fast/message_bus.py	71.74% <0.00%> (+0.37%)	⬆️
src/dbus_fast/glib/message_bus.py	82.37% <0.00%> (+2.04%)	⬆️

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[bdraco]

With this last change we are down to almost no inner python and just converting data back to pyobjects at the integration points.