new auth setting to enforce dpop

[strantalis]

We need a new platform auth setting to enforce dpop that will get exposed via what's currently known as our platform well-known endpoint. This will help drive our sdks on whether they should include dpop in the oauth flow.

{
    "configuration": {
        "health": {
            "endpoints": {
                "liveness": "/healthz?service=liveness",
                "readiness": "/healthz?service=readiness"
            }
        },
        "platform_issuer": "http://localhost:8888/auth/realms/opentdf"
        "dpop_enforced" : false
    }
}