feat: speed up unmarshaller read_array

[bdraco]

closes #36

[codecov]

Codecov Report

Base: 81.03% // Head: 80.96% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (37418f4) compared to base (db436b7).
Patch coverage: 94.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   81.03%   80.96%   -0.07%     
==========================================
  Files          24       24              
  Lines        2863     2869       +6     
  Branches      624      626       +2     
==========================================
+ Hits         2320     2323       +3     
- Misses        332      335       +3     
  Partials      211      211              

Impacted Files	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/signature.py	58.47% <0.00%> (-0.77%)	⬇️
src/dbus_fast/_private/unmarshaller.py	95.74% <98.00%> (-0.93%)	⬇️

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