Add a graph for oxygen saturation in Vital Signs tab

– Affected user(s): Clinicians, nurses

– Task affected: Vital signs monitoring

– Impact : Each time we monitor a patient's vital signs, especially the oxygen saturation level

– Current state : Users cannot view the oxygen saturation level with a graph, unlike the blood pressure or weight of a patient

This idea comes from a nurse that noticed that we couldn't view the oxygen saturation level of a patient inside a graph like we do for the blood pressure or weight. They stated that it would be useful in their day-to-day work with MYLE.