Helper function to create activity from medication administration

[tjbiel85]

To start with, just be able to go through medications and add timedeltas before and after the administration time, plus extract the patient for whom the activity is being extracted..

Perhaps down the line: define these based on things like medication name, dose, route, in order to allow for more precise control and batched definitions.

These mostly need to be definable for medications administered outside of the operating room, predominantly on L&D. For example, bolus dose medication to a labor epidural (i.e. "top ups"), which would constitute provider activity but fall outside of a Cesarean section, epidural/spinal placement, or ECV performed in the room.

[tjbiel85]

Added the most basic version of this in 00fed2c4a79d10563ad53de0efcaddd4484dd580 via AnesthesiaCaseMedicationDataSet.to_activity_dataset(). This issue will be kept open for now, might build more handling for things like medication name, dose, route, etc., if these might impact the logic of how much time should be credited.