IM-04: NHDD mapping prototype

[jecihjoy]

This PR is a proof of concept. Am extending fhir2 class ConceptTranslatorImpl that translates Concept in OpenMRS to a CodeableConcept in fhir. I have extended the class with InteropConceptTranslatorImpl which is marked as the primary bean and will be loaded instead of ConceptTranslatorImpl.

I am using csv as the mapping file.

Here is an exmple of a code with ciel code 1054 in the initial implementation with ConceptTranslatorImpl

        "coding": [
            {
                "code": "1054AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
                "display": "Civil status"
            },
            {
                "system": "https://openconceptlab.org/orgs/CIEL/sources/CIEL",
                "code": "1054",
                "display": "Civil status"
            },
            {
                "system": "http://snomed.info/sct",
                "code": "365581002",
                "display": "Civil status"
            }
        ],
        "text": "Civil status"
    }

Here is the equivaent code after nhdd mapping done here ConceptTranslatorImpl

        "coding": [
            {
                "system": "https://nhdd.health.go.ke/",
                "code": "49315",
                "display": "Civil status"
            }
        ],
        "text": "Civil status"
    }

(Here am only generating the NHDD code but we can decide whether to also retain CIEL code)