Add drug schedule

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https://en.wikipedia.org/wiki/Standard_for_the_Uniform_Scheduling_of_Medicines_and_Poisons TGA schedule needs to be added

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drug definition content only

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see https://fhir.medicationknowledge.com.au/dev/StructureDefinition-schedule-number.html

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this can be determined from drug database so is not required for ETP or summary; have put back on hold

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No mapping currently exists on the medication resource in the AU base for schedule, just haven’t got around to it yet.

Working from: https://fhir.medicationknowledge.com.au/

DB Notes:
You should map it to the following extension:
Medication.extension.schedule-number

This will need to be a string given that schedule can be a string and not strictly integer. You should then include the state as a sub value of the extension (it should be optional) but you should use the following terminology bindings to populate the state with the exception of the other value.

https://api.healthterminologies.gov.au/integration/R4/fhir/ValueSet/$expand?url=https%3A%2F%2Fhealthterminologies.gov.au%2Ffhir%2FValueSet%2Faustralian-states-territories-2&_count=100

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f2f discussion: propose to hold pending ETP reconciliation

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on hold - https://confluence.hl7.org/display/HAFWG/Resources%3A+Past+Issues+for+Future+Consideration