List consents

{
    "endpoint": "GET /v1/privacy/consents",
    "consents": [
        {
            "id": "44444444-4444-4444-4444-444444444444",
            "subjectID": "history.record.11111111-1111-1111-1111-111111111111",
            "scopes": [
                "diagnosticSampleRead"
            ],
            "source": "userAction",
            "createdAt": "2026-04-01T16:20:00Z",
            "expiresAt": "2026-04-02T16:20:00Z",
            "usageLimit": 1,
            "usageCount": 0
        }
    ]
}