feat(policy): add 'by filetype' policy

[linrongbin16]

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[codecov]

Codecov Report

Attention: 44 lines in your changes are missing coverage. Please review.

Comparison is base (7c58dba) 36.93% compared to head (b88a28f) 35.69%.

❗ Current head b88a28f differs from pull request most recent head bddaa90. Consider uploading reports for the commit bddaa90 to get more accurate results

Files	Patch %	Lines
lua/colorbox.lua	0.00%	44 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
- Coverage   36.93%   35.69%   -1.25%     
==========================================
  Files           6        6              
  Lines         861      891      +30     
==========================================
  Hits          318      318              
- Misses        543      573      +30     

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