Adds a mechanism for announce events to be forwarded to a11y. #23499
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Description
This change adds a mechanism enabling announce events to be forwarded to/handled by accessibility infra.
Related Issues
https://bugs.fuchsia.dev/p/fuchsia/issues/detail?id=67180&q=component%3AAccessibility&can=2
Tests
I added the following tests:
Accessibility bridge UTs for propagation of announce event to a11y.
Checklist
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Breaking Change
Did any tests fail when you ran them? Please read handling breaking changes.