experiment: Centralized announcer prototype

[avinashbot]

Description

Related links, issue #, if available: n/a

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[bot]]

Codecov Report

Attention: Patch coverage is 93.93939% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 95.32%. Comparing base (e5b90e8) to head (c5423c1). Report is 32 commits behind head on main.

Files	Patch %	Lines
src/internal/components/live-region/controller.ts	92.68%	3 Missing :warning:
src/internal/components/live-region/index.tsx	96.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2128      +/-   ##
==========================================
+ Coverage   95.16%   95.32%   +0.15%     
==========================================
  Files         685      688       +3     
  Lines       18342    18413      +71     
  Branches     6115     6154      +39     
==========================================
+ Hits        17455    17552      +97     
+ Misses        828      807      -21     
+ Partials       59       54       -5     

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