Room list contextual menu (#427)

- Adds `ModalBottomSheet` to our design components (it wraps the homonimous Material3 one).
- Adds  a bottom sheet to the Room list using the aforementioned design component.
- Adds navigation from the room list to a room detail (context menu "Settings" action).
- Consolidates the "leave room flow" into a new `leaveroom` module used by both the room list and the room details.
  - Adds progress indicator to the leave room flow
- Uses new `leaveroom` module in `roomdetails` module too. 

Parent issue:
- https://github.com/vector-im/element-x-android/issues/261

features/roomlist/api/src/main/kotlin/io/element/android/features/roomlist/api/RoomListEntryPoint.kt

@@ -36,6 +36,7 @@ interface RoomListEntryPoint : FeatureEntryPoint {
         fun onSettingsClicked()
         fun onSessionVerificationClicked()
         fun onInvitesClicked()
+        fun onRoomSettingsClicked(roomId: RoomId)
     }
 }