feat: add cython extension for messages

[bdraco]

This is ~6% speed up in marshalling.

[codecov]

Codecov Report

Base: 81.21% // Head: 81.49% // Increases project coverage by +0.27% 🎉

Coverage data is based on head (7bfe390) compared to base (f38e08f).
Patch coverage: 97.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   81.21%   81.49%   +0.27%     
==========================================
  Files          25       25              
  Lines        2928     2923       -5     
  Branches      569      567       -2     
==========================================
+ Hits         2378     2382       +4     
+ Misses        339      332       -7     
+ Partials      211      209       -2     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/marshaller.py	98.16% <100.00%> (ø)
src/dbus_fast/_private/unmarshaller.py	96.41% <100.00%> (ø)
src/dbus_fast/_private/util.py	86.79% <100.00%> (ø)
src/dbus_fast/introspection.py	84.92% <100.00%> (ø)
src/dbus_fast/message.py	95.50% <100.00%> (+4.01%)	⬆️
src/dbus_fast/service.py	88.29% <100.00%> (ø)
src/dbus_fast/signature.py	57.20% <100.00%> (ø)
src/dbus_fast/glib/message_bus.py	83.12% <0.00%> (+2.05%)	⬆️

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