Creates an user notification rule

curl --request POST \
  --url https://api.rootly.com/v1/users/{user_id}/notification_rules \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "user_notification_rules",
    "attributes": {
      "delay": 123,
      "position": 123,
      "user_email_address_id": "<string>",
      "user_call_number_id": "<string>",
      "user_sms_number_id": "<string>",
      "user_device_id": "<string>",
      "enabled_contact_types": [
        "email"
      ]
    }
  }
}'

{
  "data": {
    "id": "b50cc55d-52dd-4612-bf5e-a4eb68980f94",
    "type": "user_notification_rules",
    "attributes": {
      "user_id": 493,
      "delay": 2,
      "position": 1,
      "user_email_address_id": "f975b35f-55bf-4eca-8d9a-cdf5c3f42a81",
      "user_call_number_id": "47cdeb96-187f-4e85-beca-ae831ee06367",
      "user_sms_number_id": "47cdeb96-187f-4e85-beca-ae831ee06367",
      "user_device_id": "3a9cdf89-a134-474d-9c06-6268c45ec702",
      "enabled_contact_types": [
        "email"
      ],
      "created_at": "2025-08-18T10:39:11.194-07:00",
      "updated_at": "2025-08-18T10:39:11.194-07:00"
    }
  }
}