New drug exposure check: daily drug dose

[MaximMoinat]

Calculate the prescribed daily dose from drug strength, quantity and duration. This would be a plausibility concept-level check and for a set of drug/ingredient concepts we need to define ranges of expected doses.

Example: acetaminophen 500mg, quantity=60, start=2020-01-01, end=2020-30-01. Prescribed daily dose = 500*60/30=1000mg/day. And the plausible range might be something like 100-5000mg/day (can be applied for all drugs with acetaminophen ingredient).

This check would be very useful as a sanity check whether the values for quantity and exposure length are plausible.