[CCI] Standardize voice announcement for query input in the SearchBar

[SergeyMyssak]

Is your feature request related to a problem? Please describe.

After auditing advanced_settings and saved_objects_management plugins - #3963 (comment), it was discovered that the advanced_settings_voice_announcement component could be reused elsewhere to announce query input. Currently, this component is only used in one place - advanced_settings.tsx. We could also reuse it in the table.tsx (saved_objects_management plugin) and in_memory_table.tsx (OUI library component). But before we do that, we need to find out if the OuiSearchBar component actually performs the same function in the context of those components.

Describe the solution you'd like

As a solution to this problem, we can move this component to the OUI library (accessibility folder), and reuse it in the components specified above.