feat: speed up unpacking arrays

[bdraco]

This is a 4% speed up on interfaces added

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0d7a665) 83.58% compared to head (7d257b9) 83.55%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
- Coverage   83.58%   83.55%   -0.03%     
==========================================
  Files          28       28              
  Lines        3283     3290       +7     
  Branches      682      682              
==========================================
+ Hits         2744     2749       +5     
- Misses        326      327       +1     
- Partials      213      214       +1     

Files	Coverage Δ
src/dbus_fast/_private/unmarshaller.py	95.19% <100.00%> (+0.07%)	⬆️
src/dbus_fast/signature.py	62.44% <100.00%> (ø)
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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