RFR: 8359257: Create accessibility protocol for TabGroup component [v3]

[Andy Goryachev]

On Thu, 12 Jun 2025 20:46:49 GMT, Alexander Zuev <kizune at openjdk.org> wrote:

>> Create implementation of the TabGroup protocol and assign it to TAB_PANE and PAGINATION roles.
>
> Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add accessible role description to the base component

Pagination: now announces "page".

Noticed that when the buttons show pages 11-20, the focus is on button 13, it announces "you are currently on selected page, group, 3 of 10"

Should it announce the actual page number instead of the button index?

![Screenshot 2025-06-12 at 15 46 19](https://github.com/user-attachments/assets/436380c2-15df-4c97-9661-d69396f71ecf)

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PR Comment: https://git.openjdk.org/jfx/pull/1823#issuecomment-2968359201