Creates an escalation level for an Escalation Path

curl --request POST \
  --url https://api.rootly.com/v1/escalation_paths/%7Bescalation_policy_path_id%7D/escalation_levels \
  --header 'Authorization: Bearer REPLACE_BEARER_TOKEN' \
  --header 'content-type: application/vnd.api+json'

{
  "data": {
    "id": "eae61b05-ec89-4307-ae83-f8cbb5ef58d3",
    "type": "escalation_levels",
    "attributes": {
      "escalation_policy_path_id": "6bbe3cb2-c57e-45fa-858d-cd401beaef8a",
      "position": 2,
      "delay": 2,
      "escalation_policy_id": "3de3b327-a63b-481b-b69e-94baf7de3d6f",
      "created_at": "2025-03-13T12:00:20.047-07:00",
      "updated_at": "2025-03-13T12:00:20.047-07:00",
      "notification_target_params": [
        {
          "id": "107",
          "type": "user",
          "team_members": "all"
        },
        {
          "id": "0ad797ea-503f-48ed-b344-b4bfe00f2e41",
          "type": "schedule",
          "team_members": "all"
        },
        {
          "id": "CX21345",
          "type": "slack_channel",
          "team_members": "all"
        }
      ]
    }
  }
}