Gather use cases for proposed feature to better control text

[jnurthen]

Description of bug or feature request

We have had numerous attempts to better control text within aria (aria-textseparation, role=text/static etc) without getting consensus.
Gathering the use cases for this seems like a good pre-requisite to a useful implementation.

See

• https://www.w3.org/2022/09/15-aria-minutes.html#t06 for discussion
• Initial aria-textseparation (depends on generic PR being merged) #996 for text separation PR (closed)
• a3c8b80 for role static commit