feat: speed up unmarshaller

[bdraco]

No description provided.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.10% ⚠️

Comparison is base (98c7e75) 83.38% compared to head (e23bd60) 83.29%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #250      +/-   ##
==========================================
- Coverage   83.38%   83.29%   -0.10%     
==========================================
  Files          28       28              
  Lines        3263     3263              
  Branches      677      677              
==========================================
- Hits         2721     2718       -3     
- Misses        328      330       +2     
- Partials      214      215       +1     

Files Changed	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/unmarshaller.py	94.73% <ø> (-0.24%)	⬇️
src/dbus_fast/aio/message_reader.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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