Change strength representation

[korikuzma]

Currently, strength is represented as:

{
            "code": "e000009",
            "label": "preclinical evidence",
            "system": "https://go.osu.edu/evidence-codes",
        }

But should be changed to:

{
            "primaryCode": "e000009",
            "label": "preclinical evidence",
            "mappings": [
                {
                    "coding": {
                        "id": "vicc:e000009",
                        "system": "https://go.osu.edu/evidence-codes",
                        "code": "e000009",
                    },
                    "relation": "exactMatch",
                },
                {
                    "coding": {
                        "id": "civic.evidence_level:D",
                        "system": "https://civic.readthedocs.io/en/latest/model/evidence/level.html",
                        "code": "D",
                    },
                    "relation": "exactMatch",
                },
                {
                    "coding": {
                        "id": "moa.assertion_level:preclinical_evidence",
                        "system": "https://moalmanac.org/about",
                        "code": "Preclinical evidence",
                    },
                    "relation": "exactMatch",
                },
            ],
        }