List alert sources

curl --request GET \
  --url https://api.rootly.com/v1/alert_sources \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "type": "alert_sources",
      "attributes": {
        "name": "<string>",
        "source_type": "email",
        "alert_urgency_id": "<string>",
        "owner_group_ids": [
          "<string>"
        ],
        "alert_template_attributes": {
          "title": "<string>",
          "description": "<string>",
          "external_url": "<string>"
        },
        "alert_source_urgency_rules_attributes": [
          {
            "json_path": "<string>",
            "operator": "is",
            "value": "<string>",
            "conditionable_type": "AlertField",
            "conditionable_id": "<string>",
            "kind": "payload",
            "alert_urgency_id": "<string>"
          }
        ],
        "sourceable_attributes": {
          "auto_resolve": true,
          "resolve_state": "<string>",
          "accept_threaded_emails": true,
          "field_mappings_attributes": [
            {
              "field": "external_id",
              "json_path": "<string>"
            }
          ]
        },
        "resolution_rule_attributes": {
          "enabled": true,
          "condition_type": "all",
          "identifier_matchable_type": "AlertField",
          "identifier_matchable_id": "<string>",
          "identifier_reference_kind": "payload",
          "identifier_json_path": "<string>",
          "identifier_value_regex": "<string>",
          "conditions_attributes": [
            {
              "field": "<string>",
              "operator": "is",
              "value": "<string>",
              "conditionable_type": "AlertField",
              "conditionable_id": "<string>",
              "kind": "payload"
            }
          ]
        },
        "alert_source_fields_attributes": [
          {
            "alert_field_id": "<string>",
            "template_body": "<string>"
          }
        ],
        "status": "connected",
        "secret": "<string>",
        "email": "<string>",
        "webhook_endpoint": "<string>",
        "created_at": "<string>",
        "updated_at": "<string>"
      }
    }
  ],
  "links": {
    "self": "<string>",
    "first": "<string>",
    "prev": "<string>",
    "next": "<string>",
    "last": "<string>"
  }
}