Create an analytics audience for Sharezone Plus

[nilsreichardt]

      userGateway = UserGateway(references, currentUser);
      userGateway!.userStream.listen((user) {
        if (user?.typeOfUser != null) {
          analytics.setUserProperty(
            name: 'typeOfUser',
            value: user!.typeOfUser.name,
          );
        }
      });

Add hasPlus like we implemented it above