List model router configs

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/model-router/configs \
  --header 'x-api-key: <api-key>'

{
  "items": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "description": "<string>",
      "is_default": true,
      "model_chain": [
        {
          "model": "<string>",
          "config": {
            "temperature": 123,
            "max_tokens": 123,
            "top_p": 123,
            "stop_sequences": [
              "<string>"
            ],
            "request_timeout_ms": 123,
            "thinking_budget": 2
          }
        }
      ],
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "metadata": {}
    }
  ],
  "has_more": true,
  "next_cursor": "<string>"
}