Add ScrollArea to popups / menus / areas that don't fit inside screen_rect?

[lucasmerlin]

• related: Make rerun menu scrollable if there is not enough space rerun-io/rerun#10642

Currently you have to manually add a ScrollArea to a Popup::menu if it might exceed the available screen space, it'd be nice if this could be done by default (or at least via some feature of Popup or Area.

I guess that would also mean adding a max_size param to Area and it would get closer to being a Window 🤔