Add pck to voc metrics

[gitttt-1234]

Previously, Evaluator.evaluate() returned VOC metrics only using OKS as the matching score. This PR extends the evaluation to include both OKS- and PCK-based matches, and returns metrics for both in the VOC output.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.35%. Comparing base (ff91433) to head (72c2261).
⚠️ Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   95.28%   95.35%   +0.07%     
==========================================
  Files          49       49              
  Lines        6765     6960     +195     
==========================================
+ Hits         6446     6637     +191     
- Misses        319      323       +4     

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