Upgrade `registerHook` and `runHooks` as official public APIs
The helper hooks API was initially implemented in a "semi-private" fashion as part of a pilot. However, it's been in use for several years now and has proven to be quite useful (leveraged by ember-a11y-testing) and stable. This warrants exporting them as official public APIs in @ember/test-helpers. It would also allow for exposing the TypeScript types associated with the helper hooks.
CC @scalvert and @rwjblue for awareness.
I can help put up a PR for this if there are no major objections.
Please do! I think we are broadly aligned that this is good.
Thanks, @drewlee! Much appreciated!
Addressed via PR #1344
These are now documented in API.md!