Add Button CSS Variables

[agubler]

Type: feature

The following has been addressed in the PR:

• [ ] There is a related issue
• [ ] All code matches the style guide
• [ ] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [ ] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description:

Add specific vars to customise button styling without needing to change the main CSS var

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/Ea9oXrD3UPgpEKmKCKJMeryDXhWC
✅ Preview: https://widget-test-docs-git-fork-agubler-button-css-vars-dojo1.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/J1kQTW5Q4cs9cMVJACHvfPajnCKW
✅ Preview: https://dojowidgets-git-fork-agubler-button-css-vars-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1757 (c797e92) into master (05f2d0a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1757   +/-   ##
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  Coverage   90.57%   90.57%           
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  Files          95       95           
  Lines        5232     5232           
  Branches     1429     1429           
=======================================
  Hits         4739     4739           
  Misses        241      241           
  Partials      252      252           

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