Space flow improvements. (#4430)

* Space flow improvements

- Use a state machine to select a space.
- Add a SpaceFlowCoordinator for recursively presenting subspaces.
- Get the spaceRoomListProxy when tapping on the space so we can indicate failures.
- Fix the total room count in SpaceListScreen.

* Refactor spaceRoom → spaceRoomProxy.

* Add a UI test for the Spaces flow.

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -121,6 +121,8 @@ protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
     
     var sessionVerificationController: SessionVerificationControllerProxyProtocol? { get }
     
+    var spaceService: SpaceServiceProxyProtocol { get }
+    
     var isReportRoomSupported: Bool { get async }
     
     var isLiveKitRTCSupported: Bool { get async }