Create minimal GET Patient Endpoint for a FHIR API

[witash]

Describe the solution you'd like
Create a simple FHIR endpoint that returns a patient record given its ID.

{base_url}/api/fhir/v1/patient/{patient_id}/

and returns a valid patient FHIR

For this issue, ignore FHIR boilerplate including pagination, querying by attributes other than id, capability statements, etc..

include

• ability to configure which documents are patients
• mapping the required fields for FHIR patients from a document where they may have different names
• name (in FHIR format)
• sex
• date of birth
• phone