Provide RoomViewStore from the RoomContext (#30980)

* Pass roomViewStore to the RoomView and add to the RoomContext.

* lint

* lint

* Make constants more DRY

* Make constants more DRY

* Commend non-null assertion on roomViewStore property of the RoomContext

* Update tsdocs.

src/contexts/RoomContext.ts

@@ -75,6 +75,9 @@ const RoomContext = createContext<
     promptAskToJoin: false,
     viewRoomOpts: { buttons: [] },
     isRoomEncrypted: null,
+    // roomViewStore should always be present as it is passed to RoomView constructor.
+    // In time when we migrate the RoomView to MVVM it will cease to exist(become a ViewModel).
+    roomViewStore: undefined!,
 });
 RoomContext.displayName = "RoomContext";
 export default RoomContext;