enterRoom method
Implementation
Future<TUIValueCallBack<TUIRoomInfo>> enterRoom(String roomId) {
String userData = Tools.generateUserData();
Completer<TUIValueCallBack<TUIRoomInfo>> completer = Completer();
_valueCallback2Future<TUIRoomInfo>(userData, completer);
_engineSDK.Dart_EnterRoom(_engineFFIPointer,
Tools.string2PointerChar(roomId), Tools.string2PointerChar(userData));
return completer.future;
}