feat(Chat.Message): add 'author' and 'timestamp' props

[kuzhelov]

Chat.Message ('author' and 'timestamp') props

Basic layout, as well as key properties were introduced.

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

Content

<Chat.Message author="..." content="Sure thing! .." timestamp="..." />

<span class='ui-text'>Sure thing! ...</span>

Author

<Chat.Message author="Jane Doe" content="..." timestamp="..." />

<div class='ui-layout__main'>
  <h5 class='ui-header'>Jane Doe</h5>
  ..
</div>

Timestamp

<Chat.Message author="..." content="..." timestamp="Yesterday, 10:15 PM" />

<div class='ui-layout__end'>
  <span class='ui-text'>Jane Doe</span>
  ..
</div>

[codecov]

Codecov Report

Merging #41 into master will increase coverage by 3.4%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #41     +/-   ##
=========================================
+ Coverage   82.94%   86.34%   +3.4%     
=========================================
  Files          59       59             
  Lines         850      857      +7     
  Branches      195      186      -9     
=========================================
+ Hits          705      740     +35     
+ Misses        141      113     -28     
  Partials        4        4

Impacted Files	Coverage Δ
src/components/Text/Text.tsx	100% <ø> (+25%)	⬆️
src/components/Chat/ChatMessage.tsx	100% <100%> (ø)	⬆️
src/components/Layout/Layout.tsx	97.82% <0%> (+10.86%)	⬆️
src/components/Text/textRules.ts	100% <0%> (+100%)	⬆️
src/components/Text/textVariables.ts	100% <0%> (+100%)	⬆️

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[kuzhelov]

closing as this functionality will be introduced by #242.