fix: better capability sharp and squoosh implementations

[RAX7]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

squoosh throws an unknown format error when using a generator, but not when using a minimizer.
sharp also now follows this behavior.

[codecov]

Codecov Report

Base: 88.26% // Head: 88.31% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (d6b9ad5) compared to base (593d116).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
+ Coverage   88.26%   88.31%   +0.05%     
==========================================
  Files           4        4              
  Lines         673      676       +3     
  Branches      259      260       +1     
==========================================
+ Hits          594      597       +3     
  Misses         71       71              
  Partials        8        8              

Impacted Files	Coverage Δ
src/utils.js	81.09% <100.00%> (+0.15%)	⬆️

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