Refactor Selector with Floating UI

[axelboc]

This was a bit more complicated because of the option groups in the color map selector, since it forced me to use FloatingList and useListItem.

But ... I can now remove react-aria-menubutton at last :tada:

Next steps:

• Refactor OverflowMenu and InteractionHelp with Floating UI to gain a few features (auto-placement, better accessibility and focus management, etc.)
• ~Refactor option groups and a few other bits and pieces in Selector~
• Deprecate align prop of ExportMenu
• Abstract duplicated logic into custom hooks