Get central server channels

curl --request GET \
  --url http://localhost:3000/api/messaging/central-servers/{serverId}/channels

{
  "success": true,
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "serverId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "type": "text",
      "description": "<string>",
      "metadata": {}
    }
  ]
}