update KGX to optionally provide "retrieval_source_ids" attribute to collect information retrieval properties

[sierra-moxon]

Currently, when primary_knowledge_source is not provided, KGX by default tries to add this to its transforms. We should make this an optional transformation, and in addition, add the ability to produce TRAPI-specific KGX.

"retrieval_source_ids":
    [
        {
            "resource_id": "infores:cohd",
            "resource_role": "primary_knowledge_source"
        },
        {
            "resource_id": "infores:columbia-cdw-ehr-data",
            "resource_role": "supporting_data_source"
        }
    ]