List account notification endpoints and unread status

curl -X GET "https://example.com/v1/notifications/endpoints"

{
  "endpoints": [
    {
      "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
      "accountId": "3d07c219-0a88-45be-9cfc-91e9d095a1e9",
      "url": "string",
      "profile": {
        "kind": "standard"
      },
      "createdBy": "25a02396-1048-48f9-bf93-102d2fb7895e",
      "createdAt": "2019-08-24T14:15:22Z",
      "disabledAt": "2019-08-24T14:15:22Z",
      "lastAttemptAt": "2019-08-24T14:15:22Z",
      "lastSuccessAt": "2019-08-24T14:15:22Z",
      "lastError": "invalid_target"
    }
  ],
  "status": {
    "position": "string",
    "unreadCount": 0,
    "oldestUnreadAt": "2019-08-24T14:15:22Z"
  }
}