feat: add unpack variants benchmark

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 81.57% // Head: 81.40% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (39ed598) compared to base (7326bdf).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   81.57%   81.40%   -0.18%     
==========================================
  Files          25       25              
  Lines        2937     2937              
  Branches      566      566              
==========================================
- Hits         2396     2391       -5     
- Misses        334      337       +3     
- Partials      207      209       +2     

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/glib/message_bus.py	81.06% <0.00%> (-2.06%)	⬇️

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