Add a new RoomThreadListScreen and hook it up to the RoomThreadListService

It will automatically paginate to fill the screen and update the list as updates come in.

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -119,6 +119,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
             guard let successorID = roomProxy.infoPublisher.value.successor?.roomId else { return }
             let serverNames = roomProxy.knownServerNames(maxCount: 50) // Limit to the same number used by ClientProxy.resolveRoomAlias(_:)
             actionsSubject.send(.displayRoom(roomID: successorID, via: Array(serverNames)))
+        case .displayThreadList:
+            actionsSubject.send(.displayThreadList)
         }
     }