feat: add optimized reader for GetManagedObjects

[bdraco]

This is a 4% speed up

[codecov]

Codecov Report

Base: 82.02% // Head: 82.11% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (edbb505) compared to base (2d56622).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head edbb505 differs from pull request most recent head 06bdc38. Consider uploading reports for the commit 06bdc38 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   82.02%   82.11%   +0.09%     
==========================================
  Files          27       27              
  Lines        3110     3126      +16     
  Branches      641      645       +4     
==========================================
+ Hits         2551     2567      +16     
  Misses        344      344              
  Partials      215      215              

Impacted Files	Coverage Δ
src/dbus_fast/_private/unmarshaller.py	95.54% <100.00%> (+0.20%)	⬆️

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[bdraco]

Tested on production 👍