curl --request GET \
  --url https://api.portkey.ai/v1/collections \
  --header 'x-portkey-api-key: <api-key>'

{
  "total": 123,
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "workspace_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "slug": "<string>",
      "parent_collection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "is_default": true,
      "status": "active",
      "created_at": "2023-11-07T05:31:56Z",
      "last_updated_at": "2023-11-07T05:31:56Z",
      "collection_details": {
        "child_collections_count": 123,
        "prompts_count": 123,
        "child_collections_last_updated_at": "2023-11-07T05:31:56Z",
        "prompts_last_updated_at": "2023-11-07T05:31:56Z"
      }
    }
  ]
}