Set the gate noise and measurement noise of a payload.

def _maybe_add_noise_to_payload(self, payload):
        """
        Set the gate noise and measurement noise of a payload.
        """
        if self.measurement_noise is not None:
            payload["measurement-noise"] = self.measurement_noise
        if self.gate_noise is not None:
            payload["gate-noise"] = self.gate_noise