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": {
      "position": 123,
      "notification_target_params": [
        {
          "id": "<string>",
          "type": "team",
          "team_members": "all"
        }
      ],
      "delay": 123,
      "paging_strategy_configuration_strategy": "default",
      "paging_strategy_configuration_schedule_strategy": "on_call_only",
      "escalation_policy_path_id": "<string>"
    }
  }
}
'

{
  "data": {
    "id": "4900a272-0825-4b0d-8420-82a8e9f0cde4",
    "type": "escalation_levels",
    "attributes": {
      "escalation_policy_path_id": "93e7532e-ce24-41a9-b713-006525c12a6c",
      "position": 1,
      "delay": 2,
      "escalation_policy_id": "c8e4994e-31a5-48ce-aec6-10bdbf3210c0",
      "paging_strategy_configuration_strategy": null,
      "paging_strategy_configuration_schedule_strategy": null,
      "created_at": "2025-12-05T15:06:11.276-08:00",
      "updated_at": "2025-12-05T15:06:11.276-08:00",
      "notification_target_params": [
        {
          "id": "158",
          "type": "user",
          "team_members": "all"
        },
        {
          "id": "0e6e8fe7-1d5e-4214-82c4-b29ec55fd539",
          "type": "schedule",
          "team_members": "all"
        },
        {
          "id": "CX21345",
          "type": "slack_channel",
          "team_members": "all"
        }
      ]
    }
  }
}