Preview catalog entities

Example response

{
  "data": [
    {
      "relationships": {
        "incidents": {
          "data": [
            {
              "type": "incident"
            }
          ]
        },
        "oncalls": {
          "data": [
            {
              "type": "oncall"
            }
          ]
        },
        "rawSchema": {
          "data": {
            "type": "rawSchema"
          }
        },
        "relatedEntities": {
          "data": [
            {
              "type": "relatedEntity"
            }
          ]
        },
        "schema": {
          "data": {
            "type": "schema"
          }
        }
      },
      "type": "entity"
    }
  ]
}