Automate extraction from QuestionnaireResponses of Encounters and Observations

[pld]

Whenever a content creator wants to extract Encounters or Observations from StructureMaps they must manually encode a function per question in the StructureMap.

We want to change this by:

1. Encoding static data that is stored in the StructureMaps but linked to specific questions in the Questionnaire
   • e.g. codes
   • we can write a Profile for Questionnaire that enforces the inclusion of those elements required for the StructureMap to properly function
2. Write a CQL library (??) that we can use in our StructureMaps to automatically extract an Encounter and an Observation per question from a QuestionnaireResponse
   • is this better as something in kotlin in FHIR Core?
   • is this better as tooling to generate a large StructureMap?
   • is this better as a template StructureMap?

Current needs to be attached to this issue:

• Example Questionnaire
• Example QuestionnaireResponse
• Example StructureMap
• Example Encounter
• Example Observations

cc @f-odhiambo @dubdabasoduba @ageryck @Wambere