Construct a notification callback for the given request ID.

def _notification_callback(method, params):
        """Construct a notification callback for the given request ID."""
        def callback(future):
            try:
                future.result()
                log.debug("Successfully handled async notification %s %s", method, params)
            except Exception:  # pylint: disable=broad-except
                log.exception("Failed to handle async notification %s %s", method, params)
        return callback