Suggestion: ARIA list on Carousel

Created by: thejimbirch

There has been discussion, and incorrectly implemented ARIA listbox was removed in issues #22061 (closed) and #22543 (closed) by @patrickhlauke

I would like to suggest the ARIA list https://www.w3.org/TR/wai-aria/roles#list and listitem https://www.w3.org/TR/wai-aria/roles#listitem roles to the .carousel-inner and .carousel-item.

Pull request to follow.