feat: Add intubation as a new disturbance profile

[marco-milanesi]

New disturbance profile (A) as proposed in Performance Evaluation of Two Published Closed-loop Control Systems Using Bispectral Index Monitoring: A Simulation Study

[BobAubouin]

Hi Marco,

Can you add the option also in the docstring of the function to make it appear in the documentation ?
Maybe that you can also update the test about disturbance to include this new one (although the implementation doesn't seem to be source of error).

Thanks,
Bob