List watches on an auction

curl --request GET \
  --url https://api.auctionnow.io/api/alpha/merchant/auctions/{slug}/watches

{
  "data": [
    {
      "watchId": "<string>",
      "bidderId": "<string>",
      "bidderName": "<string>"
    }
  ],
  "timestamp": 123,
  "message": "<string>"
}