Creates an escalation level for an Escalation Policy

curl --request POST \
  --url https://api.rootly.com/v1/escalation_policies/{escalation_policy_id}/escalation_levels \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "escalation_levels",
    "attributes": {
      "delay": 123,
      "position": 123,
      "paging_strategy_configuration_strategy": "default",
      "paging_strategy_configuration_schedule_strategy": "on_call_only",
      "escalation_policy_path_id": "<string>",
      "notification_target_params": [
        {
          "id": "<string>",
          "type": "team",
          "team_members": "all"
        }
      ]
    }
  }
}'

{
  "data": {
    "id": "14ecd08e-01b8-4fd9-a835-eb2c1250d86d",
    "type": "escalation_levels",
    "attributes": {
      "escalation_policy_path_id": "39bd5abf-d400-4e32-afe2-cacb907f6c18",
      "position": 1,
      "delay": 2,
      "escalation_policy_id": "3de40948-a5ab-4d63-aa37-e05d2474d2f7",
      "paging_strategy_configuration_strategy": null,
      "paging_strategy_configuration_schedule_strategy": null,
      "created_at": "2025-05-29T17:41:56.621-07:00",
      "updated_at": "2025-05-29T17:41:56.621-07:00",
      "notification_target_params": [
        {
          "id": "102",
          "type": "user",
          "team_members": "all"
        },
        {
          "id": "398368e8-1038-4496-86d3-b88eec1c23ee",
          "type": "schedule",
          "team_members": "all"
        },
        {
          "id": "CX21345",
          "type": "slack_channel",
          "team_members": "all"
        }
      ]
    }
  }
}