feat: Add API to exclude tokens from JSON output

[fralongo]

We are currently including all exposed tokens in the JSON output, but some of them (e.g. motion keyframes) only makes sense in a CSS context due to their dependency with CSS custom variables. This API allows to exclude them, and will be used in the main components package.

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (b8caa85) 96.81% compared to head (c170063) 96.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   96.81%   96.83%   +0.01%     
==========================================
  Files          42       42              
  Lines         974      978       +4     
  Branches      114      116       +2     
==========================================
+ Hits          943      947       +4     
  Misses         29       29              
  Partials        2        2              

Impacted Files	Coverage Δ
src/__fixtures__/common.ts	100.00% <100.00%> (ø)
src/build/internal.ts	100.00% <100.00%> (ø)
src/build/tasks/public-tokens.ts	100.00% <100.00%> (ø)

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[just-boris]

Can people ignore these tokens on their end? There could be different use-cases, are we going to create one more JSON, if these tokens become useful for somebody else?

[fralongo]

Can people ignore these tokens on their end? There could be different use-cases, are we going to create one more JSON, if these tokens become useful for somebody else?

I think that it is safer to remove them now. Adding them in the future is backward compatible.

[just-boris]

We have a defined list of public tokens. Having exclusions from this list seem like a system design concern for me

[fralongo]

We have a defined list of public tokens. Having exclusions from this list seem like a system design concern for me

I will add documentation about it in the design tokens page.

[fralongo]

Closing this PR as we prefer clarity and cleanliness to the risk of publishing tokens that might be unusable in some tech stacks.