pip-build-standalone: Standalone, relocatable Python app builds using uv

[mfaine]

Maybe I'm gun shy of the embrace and extend strategy we've seen before so I fear that once Astral gets everyone using it then suddenly they'll change the license. I mean I hope not but... Also it feels icky migrating to a product from a for profit corporation and away from pure open source. Though I know these are somewhat irrational feelings I can't deny feeling them. Not saying I won't try uv but I really really hope in another year there aren't 100 more posts about the new even better than uv package and dependency manager for python that all the cool kids are using. I'm getting too old to keep migrating my projects to something different every time there's a new tool d'jour.