feat: speed up marshalling variants

[bdraco]

This is roughly a 3% speed up marshalling most messages

This is pre-work for optimizing write_array in #84

[codecov]

Codecov Report

Base: 81.42% // Head: 81.36% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (7f4d270) compared to base (07e6886).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   81.42%   81.36%   -0.06%     
==========================================
  Files          25       25              
  Lines        2928     2930       +2     
  Branches      566      566              
==========================================
  Hits         2384     2384              
- Misses        335      337       +2     
  Partials      209      209              

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/_private/marshaller.py	98.26% <100.00%> (+0.03%)	⬆️
src/dbus_fast/message_bus.py	72.43% <0.00%> (-0.39%)	⬇️

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