feat(Menu): Update styling for *primary underlined* to match Teams style

[miroslavstastny]

Menu underlined primary

Style of the underlined primary menu was updated to match Teams look and feel.

Stardust Before:

Stardust After:

Real Teams:

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

The main change is that previously the whole menu item was underlined but now only the caption is underlined.

I was thinking about implementing it conditionally using fitted prop but I do not see any use for the old look in Teams. For that reason I consider it the only look for underlined menu in Teams theme.

Clone of stardust-ui/react-old#107

[codecov]

Codecov Report

Merging #20 into master will decrease coverage by 0.07%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   87.45%   87.37%   -0.08%     
==========================================
  Files          74       74              
  Lines        1124     1125       +1     
  Branches      210      200      -10     
==========================================
  Hits          983      983              
- Misses        137      138       +1     
  Partials        4        4

Impacted Files	Coverage Δ
src/components/Menu/menuVariables.ts	100% <ø> (ø)	⬆️
src/components/Menu/menuRules.ts	100% <ø> (ø)	⬆️
src/components/Menu/menuItemRules.ts	83.87% <0%> (-2.8%)	⬇️

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