chore: Styling tools

[pan-kot]

Same as cloudscape-design/components#4720, but created in the component-toolkit.

This is needed to address an internal build failure caused by styling utils not available in test pages, but also to eventually use these tools across different component repositories.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.01%. Comparing base (556e877) to head (1cc4a0b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          44       44           
  Lines        1314     1314           
  Branches      363      341   -22     
=======================================
  Hits         1301     1301           
  Misses         13       13           

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