feat(Button): adding disabled prop to Button

[bmdalex]

Button(disabled prop)

This PR will introduce possibility to specify disabled buttons

This PR depends on the changes introduced in #111 so it contains these as well; #111 should be merge first and then this branch should be rebased

TODO

• Conformance test
• Minimal doc site example
• Stardust base theme
• Teams Light theme
• Teams Dark theme
• Teams Contrast theme
• Confirm RTL usage
• W3 accessibility check
• Stardust accessibility check
• Update glossary props table
• Update the CHANGELOG.md

API Proposal

disabled

disabled property will disable buttons by manipulating opacity CSS style, borders, colors, hover styles and preventing clicking

Know issue: Icons are not disabled because disabled property was not added to icons at the time of creating this PR. I created a PR for that #113
Icon buttons will become disabled out of the box after merging that one

<Button disabled content="Click me" />

will render

<button class="ui-button" disabled="">
  <span>Click me</span>
</button>

[codecov]

Codecov Report

Merging #114 into master will decrease coverage by 0.02%.
The diff coverage is 77.96%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage    69.8%   69.77%   -0.03%     
==========================================
  Files          75       76       +1     
  Lines        1202     1244      +42     
  Branches      228      221       -7     
==========================================
+ Hits          839      868      +29     
- Misses        358      371      +13     
  Partials        5        5

Impacted Files	Coverage Δ
src/components/Icon/iconVariables.ts	100% <ø> (ø)	⬆️
src/components/Button/buttonVariables.ts	100% <ø> (ø)	⬆️
src/components/Icon/iconRules.ts	90.47% <ø> (ø)	⬆️
src/styles/customCSS.ts	100% <100%> (ø)
src/components/Button/Button.tsx	70.58% <68.75%> (-29.42%)	⬇️
src/components/Button/buttonRules.ts	91.66% <88%> (-8.34%)	⬇️

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[bmdalex]

Moved to new repo: stardust-ui/react/pull/14