Add some new space properties. (#4544)

* Use the via property on SpaceRoom.

* Fall back to the canonical alias as a space room name if needs be.

* Use SpaceRoom.isDirect for computing the name/avatar.

* Pass in the parent space as a workaround for no restricted join rules.

ElementX/Sources/Mocks/SpaceServiceProxyMock.swift

@@ -19,7 +19,7 @@ extension SpaceServiceProxyMock {
         self.init()
         
         joinedSpacesPublisher = .init(configuration.joinedSpaces)
-        spaceRoomListSpaceIDClosure = { spaceID in
+        spaceRoomListSpaceIDParentClosure = { spaceID, _ in
             if let spaceRoomList = configuration.spaceRoomLists[spaceID] {
                 .success(spaceRoomList)
             } else {