feat: Add exclude_assets option

[peaceiris]

Note that this option does not support regular expression currently.

Related to #163

[codecov]

Codecov Report

Merging #416 into main will decrease coverage by 1.44%.
The diff coverage is 8.33%.

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
- Coverage   55.17%   53.73%   -1.45%     
==========================================
  Files           4        4              
  Lines         261      268       +7     
  Branches       50       51       +1     
==========================================
  Hits          144      144              
- Misses        116      123       +7     
  Partials        1        1              

Impacted Files	Coverage Δ
src/get-inputs.ts	100.00% <ø> (ø)
src/git-utils.ts	34.92% <8.33%> (-2.06%)	⬇️

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