List Topics

curl --request GET \
  --url https://public.api.serval.com/v2/topics \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "teamId": "<string>",
      "name": "<string>",
      "description": "<string>",
      "parentTopicId": "<string>",
      "subTopics": "<array>",
      "ticketCount": 123
    }
  ],
  "nextPageToken": "<string>"
}