Add support for fhir_code, fhir_url and fhir_resource

[projkov]

Ref: #69

Usage example

@sdk.operation(
    ["GET"],
    ["fhir", "Patient", {"name": "id"}, "$summary"],
    compliance={
        "fhirUrl": "http://hl7.org/fhir/uv/ips/OperationDefinition/summary",
        "fhirCode": "summary",
        "fhirResource": ["Patient"],
    },
)
async def summary_op(_operation: SDKOperation, request: SDKOperationRequest) -> web.Response:
    pass

[ir4y]

Let's name it compliance.

Use https://peps.python.org/pep-0589/ to define required keys in the dict.

[ir4y]

Add tests