core: refactor medication tables to use modern denormalization

[mikix]

core__medication:

• Template cleanup to use standard denorm tables rather than custom extraction code.
• If contained resources provide actual codes, we pull them out now (previously we only looked at the contained Concept.text)
• No longer pull Concept.text from contained Medications, until we decide on an approach for Concept.text across the board)

core__medicationrequest:

• No longer ignores rows without dosageInstruction.text

General CodeableConcept denormalization:

• Add userSelected boolean field to all denorm tables
• Allow the Python code to request extra fields to include along with the coding information (used for capturing contained.id fields)

Misc:

• Depend on cumulus-fhir-support 1.1 for its contained schema support

Fixes #218

Checklist

• [x] Consider if documentation (like in docs/) needs to be updated
• [x] Consider if tests should be added
• [x] Update template repo if there are changes to study configuration