feat: optimize passive bluez message unmarshaller

[bdraco]

This is ~3% speed up

[codecov]

Codecov Report

Patch coverage: 91.66% and project coverage change: +0.18% 🎉

Comparison is base (d771bcf) 82.52% compared to head (c6e9b78) 82.71%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   82.52%   82.71%   +0.18%     
==========================================
  Files          27       27              
  Lines        3211     3216       +5     
  Branches      665      666       +1     
==========================================
+ Hits         2650     2660      +10     
+ Misses        343      341       -2     
+ Partials      218      215       -3     

Files Changed	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/unmarshaller.py	95.95% <100.00%> (+0.05%)	⬆️
src/dbus_fast/signature.py	62.11% <100.00%> (-0.17%)	⬇️

... and 2 files with indirect coverage changes

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[bdraco]

All good overnight