List role groups

curl --request GET \
  --url https://api.readmin.app/sessions/v2/roles \
  --header 'loader-id: <api-key>'

{
  "success": true,
  "data": [
    {
      "id": "<string>",
      "name": "<string>",
      "roles": [
        {
          "id": "<string>",
          "name": "<string>"
        }
      ]
    }
  ]
}