Wildcard: Add `<Popover />`

Created by: umpox

Description

Adds the @reach/popover wrapper to Wildcard.

This is an initial implementation to unblock any migration work. We want to start migrating the codebase to this new approach, this will help us understand any problems better and come up with a solution.

@vovakulikov I know you mentioned wanting to revisit how we position our Popovers, maybe using floating-ui. I agree that we should do this, would be keen to know if you've looked into this any further since our conversation? For now, I'm preserving the current behavior to unblock other work.