This diff introduces the barebones keyserver selection bottom sheet component as well as all the necessary logic needed to add this to the root navigator to eventually route to it. Subsquent diffs will handle fully introducing the UI and all the other functionality needed for this bottom sheet
Linear task: https://linear.app/comm/issue/ENG-5472/add-keyserverselectionbottomsheet-to-the-root-navigator
Depends on D9725