Add support for joining rooms from a space. (#4501)

* Add support for joining rooms from a space.

Doesn't yet handle the Join button 🤔

* Handle the join button for both rooms and spaces.

Also refactor more instances of spaceRoom to spaceRoomProxy.

ElementX/Sources/Screens/JoinRoomScreen/JoinRoomScreenViewModel.swift

@@ -6,6 +6,7 @@
 //
 
 import Combine
+import MatrixRustSDK
 import SwiftUI
 
 typealias JoinRoomScreenViewModelType = StateStoreViewModel<JoinRoomScreenViewState, JoinRoomScreenViewAction>
@@ -211,8 +212,8 @@ class JoinRoomScreenViewModel: JoinRoomScreenViewModelType, JoinRoomScreenViewMo
                     state.mode = .inviteRequired
                 case .knock, .knockRestricted:
                     state.mode = appSettings.knockingEnabled ? .knockable : .joinable
-                case .restricted:
-                    state.mode = .restricted
+                case .restricted(let rules):
+                    state.mode = clientProxy.canJoinRoom(with: rules) ? .joinable : .restricted
                 default:
                     state.mode = .joinable
                 }