SPIKE: Add FHIR IG version to converter API

[austin-hall-skylight]

Description

Applications making requests to the FHIR Converter should have a way to retrieve the version of the FHIR eCR implementation guide that the FHIR Converter conforms to.

What needs to be done

Calling GET [baseUrl]/ (or maybe GET [baseUrl]/$versions if we want to be consistent with the FHIR spec for ease of use) returns an object with the FHIR eCR version and FHIR version.

Why it needs to be done

Client applications may this information to process bundles differently based on the IG version.

Acceptance Criteria

• Making a GET request to the version endpoint returns an object that contains the FHIR eCR IG version and the FHIR version that are used by the FHIR converter.