List Retrospective Process Groups

curl --request GET \
  --url https://api.rootly.com/v1/retrospective_processes/{retrospective_process_id}/groups \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "type": "retrospective_process_groups",
      "attributes": {
        "retrospective_process_id": "<string>",
        "sub_status_id": "<string>",
        "position": 123
      }
    }
  ],
  "links": {
    "self": "<string>",
    "first": "<string>",
    "prev": "<string>",
    "next": "<string>",
    "last": "<string>"
  }
}