feat(config): add per-file config

[Nytelife26]

Relevant issues

Relevant to #1466. Blocked by #1468. Resolves #1358.

Brief

Add the ability to override check configuration on a per-file basis using overrides.

Changes

• Add file_checks to Config
• Apply file_checks as an override to Config.checks for files matching partial globs given by keys of Config.file_checks

Remaining work

• Document this feature
• Document the caveat that this does not support full glob syntax (see pathlib.PurePath.match)
• Consider renaming to per_file_checks
• Compare with expanding globs in per_file_checks and pre-computing possible configurations
  • This would save checking each per_file_checks entry for every file
  • It would add up-front merges, which is worse than the lazy approach
  • Keep the lazy approach and cache results instead to avoid re-computing for future paths that also match the glob?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.59%. Comparing base (505e07c) to head (cad0f12).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
+ Coverage   92.56%   92.59%   +0.02%     
==========================================
  Files         100      100              
  Lines        1022     1026       +4     
==========================================
+ Hits          946      950       +4     
  Misses         76       76              

Flag	Coverage Δ
macos-latest	92.00% <100.00%> (+0.03%)	⬆️
py3.10	92.59% <100.00%> (+0.02%)	⬆️
py3.11	92.59% <100.00%> (+0.02%)	⬆️
py3.12	92.59% <100.00%> (+0.02%)	⬆️
py3.13	92.00% <100.00%> (+0.03%)	⬆️
py3.14	92.00% <100.00%> (+0.03%)	⬆️
ubuntu-latest	92.00% <100.00%> (+0.03%)	⬆️
windows-latest	92.59% <100.00%> (+0.02%)	⬆️

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