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

Marked as reviewed by angorya (Reviewer).

I am ok with addressing Pagination index issue in a separate PR, though I wonder how much work it is - since we are fixing it here, why not finish it in this PR.

But if you prefer a separate PR, this lgtm.

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PR Review: https://git.openjdk.org/jfx/pull/1823#pullrequestreview-2932618876
PR Comment: https://git.openjdk.org/jfx/pull/1823#issuecomment-2977108436