Split MatrixRoom into BaseRoom and JoinedRoom (#4561)

`JoinedRoom` will now contain both a mandatory live timeline reference and all the functionality associated to it.

`BaseRoom` on the other hand will contain only functionality that's shared for both joined and not joined rooms.

`NotJoinedRoom` is a wrapper around `RoomPreviewInfo` data and a possible local `BaseRoom`, if it exists.

The `RustRoomFactory` cache is now gone since the persistent event cache should have the same effect.

features/roomlist/impl/src/main/kotlin/io/element/android/features/roomlist/impl/RoomListPresenter.kt

@@ -319,8 +319,6 @@ class RoomListPresenter @Inject constructor(
 
     private fun CoroutineScope.clearCacheOfRoom(roomId: RoomId) = launch {
         client.getRoom(roomId)?.use { room ->
-            // Ideally we wouldn't have a live timeline at this point, but right now we instantiate one when retrieving the room
-            room.liveTimeline.close()
             room.clearEventCacheStorage()
         }
     }