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": "54713297-50d8-42ce-b21c-63f9613db0bf",
    "type": "user_notification_rules",
    "attributes": {
      "user_id": 509,
      "delay": 2,
      "position": 1,
      "user_email_address_id": "f0673dac-7a93-4f3e-adfc-9303c1611449",
      "user_call_number_id": "e0f00fbd-86e4-42ea-a739-c6a2bd61f3d8",
      "user_sms_number_id": "e0f00fbd-86e4-42ea-a739-c6a2bd61f3d8",
      "user_device_id": "2668f91f-5bb0-4bba-b1be-0f257c33952b",
      "enabled_contact_types": [
        "email"
      ],
      "created_at": "2025-09-16T17:18:43.966-07:00",
      "updated_at": "2025-09-16T17:18:43.966-07:00"
    }
  }
}