Added set_wait_time and ACTION_MEASURE callback for tune

[JeanLucPons]

def tune_callback(step: int, action: int, m: Magnet, dtune: np.array):
    if action == ACTION_MEASURE:
        # On action measure, the measured dq / dk is passed as argument
        print(f"Tune response: #{step} {m.get_name()} {dtune}")
    return True
...
tune_adjust.response.measure(callback=tune_callback,set_wait_time=0.0 if SR == sr.design else 2.0)

[JeanLucPons]

This PR can be merged and should not bring any backward compatibility issue.