Add support for the Web Extensions permissions.request() API.
Pull request: https://github.com/WebKit/WebKit/pull/8333
<rdar://problem/104182674>
Committed 260370@main (65e4c3db6cba): <https://commits.webkit.org/260370@main> Reviewed commits have been landed. Closing PR #8333 and removing active labels.
*** Bug 250238 has been marked as a duplicate of this bug. ***