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": "9033566b-59a2-4e09-9f51-bf4fed804638",
    "type": "user_notification_rules",
    "attributes": {
      "user_id": 535,
      "delay": 2,
      "position": 1,
      "user_email_address_id": "c8cf4ce3-0b1c-4b2e-9cf1-299e985eb656",
      "user_call_number_id": "eab0f7fc-6083-4889-8104-8f11f3164e36",
      "user_sms_number_id": "eab0f7fc-6083-4889-8104-8f11f3164e36",
      "user_device_id": "4ae513d3-a90e-451c-abeb-082314e07a4e",
      "enabled_contact_types": [
        "email"
      ],
      "created_at": "2025-10-08T04:40:18.983-07:00",
      "updated_at": "2025-10-08T04:40:18.983-07:00"
    }
  }
}