feat: add unmarshaller cython typing for SignatureType and SignatureTree

[bdraco]

No description provided.

[codecov]

Codecov Report

Base: 82.27% // Head: 82.37% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (4d8e038) compared to base (1e32f28).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 4d8e038 differs from pull request most recent head cd98ee9. Consider uploading reports for the commit cd98ee9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   82.27%   82.37%   +0.09%     
==========================================
  Files          27       27              
  Lines        3137     3137              
  Branches      647      647              
==========================================
+ Hits         2581     2584       +3     
+ Misses        340      338       -2     
+ Partials      216      215       -1     

Impacted Files	Coverage Δ
src/dbus_fast/_private/unmarshaller.py	96.42% <100.00%> (ø)
src/dbus_fast/proxy_object.py	78.52% <0.00%> (+2.01%)	⬆️

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