Creates a Catalog Field

curl --request POST \
  --url https://api.rootly.com/v1/catalogs/{catalog_id}/fields \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "catalog_fields",
    "attributes": {
      "name": "<string>",
      "kind": "text",
      "kind_catalog_id": "<string>",
      "multiple": true,
      "position": 123
    }
  }
}'

{
  "data": {
    "id": "30e4eaa6-b6e0-451f-ae5b-c8e9c77c83b1",
    "type": "catalog_fields",
    "attributes": {
      "catalog_id": "05cb4ed7-a59f-44a3-8e13-00d40c9c6696",
      "name": "Test Attribute",
      "slug": "test-attribute",
      "kind": "reference",
      "kind_catalog_id": null,
      "multiple": false,
      "position": 2,
      "deleted_at": null,
      "updated_at": "2025-09-17T17:44:45.375-07:00",
      "created_at": "2025-09-17T17:44:45.375-07:00"
    },
    "relationships": {
      "catalog": {
        "data": {
          "id": "05cb4ed7-a59f-44a3-8e13-00d40c9c6696",
          "type": "catalogs"
        }
      }
    }
  }
}