docs: Add conventional commit types to contributing guide

[vdusek]

Summary

• Added a new "Commits" section to CONTRIBUTING.md with a table of available conventional commit types.
• Placed before the "Release process" section to provide context for how version bumps are determined.

Test plan

• Verify the markdown table renders correctly on GitHub.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (6034c49) to head (e1e0f39).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #769   +/-   ##
=======================================
  Coverage   81.91%   81.91%           
=======================================
  Files          46       46           
  Lines        2693     2693           
=======================================
  Hits         2206     2206           
  Misses        487      487           

Flag	Coverage Δ
integration	55.95% <ø> (ø)
unit	68.06% <ø> (ø)

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