Add build flag for default ARIA, and add the support for ElementInternals.role, ariaLabel, and ariaRoleDescription.
<rdar://problem/99548935>
Pull request: https://github.com/WebKit/WebKit/pull/4010
Committed 254278@main (f2257d53ead3): <https://commits.webkit.org/254278@main> Reviewed commits have been landed. Closing PR #4010 and removing active labels.