New PR that replaces #26509 because the fork was deleted. This doesn't carbon-copy that PR's changes though. Instead, I've opted for two utilities to start—.overflow-auto and .overflow-hidden. No responsiveness, no x/y variants, and not every option. This PR also adds documentation which was missing from previous efforts.
I've also moved the $positions Sass list to the _variables.scss file alongside the new $overflows list. Folks can then customize both easily enough and gain more options.
Fixes #26479 (closed).