Get Person Entitlements

{  "grants": [    {      "expiresAt": "string",      "perkId": "string",      "source": "subscription",      "sourceId": "string",      "sourcePersonId": "string",      "status": "active"    }  ]}

{  "_tag": "Api/NotAuthenticatedError",  "message": "string"}

{  "_tag": "Api/ActionForbiddenError",  "message": "string"}

{  "_tag": "Api/PersonNotFoundError",  "id": "string"}

{  "_tag": "Api/PersonServiceError",  "cause": "string"}