Add a HTTP endpoint for health check

Enable a HTTP PORT for Health check. We are configuring websocket port using following configuration-

public SocketIOServer socketIOServer() {
        Configuration configuration = new Configuration();
        configuration.setHostname(hostname);
        configuration.setPort(port);
        return new SocketIOServer(configuration);
    }

But currently, there is no health check endpoint available on configured PORT. Can we please add a health check endpoint to enable library to support liveness probe and readiness probe under kubernetes deployment. @mrniko @unverbraucht