List user groups

curl "{{API_URL}}/api/v1/user_groups/" \
  --request GET \
  --header "Authorization: meowmeowmeow" \
  --header "Content-Type: application/json"

{
  "count": 1,
  "next": null,
  "previous": null,
  "results": [
    {
      "id": "GPFAPH7J7BKJB",
      "type": "slack_based",
      "slack": {
        "id": "MEOW_SLACK_ID",
        "name": "Meow Group",
        "handle": "meow_group"
      }
    }
  ],
  "current_page_number": 1,
  "page_size": 50,
  "total_pages": 1
}