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

[Alexander Zuev]

> 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

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1823/files
  - new: https://git.openjdk.org/jfx/pull/1823/files/1d0bda30..977047d8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1823&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1823&range=01-02

  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1823.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1823/head:pull/1823

PR: https://git.openjdk.org/jfx/pull/1823