feat: Chat bubble

[cansuaa]

Description

New chat bubble component

Related links, issue #, if available: AWSDesignSystem-462

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.23%. Comparing base (ea82360) to head (27cf2f6).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   96.98%   99.23%   +2.24%     
==========================================
  Files          16       19       +3     
  Lines         398      520     +122     
  Branches       26       64      +38     
==========================================
+ Hits          386      516     +130     
+ Misses         12        4       -8     

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