Create Cart

curl --request POST \
  --url https://client-request-service-staging-wghsjlqnoa-uw.a.run.app/cart/create \
  --header 'Content-Type: application/json' \
  --data '{
  "items": [
    {
      "quantity": 1,
      "variantId": "12376205435060"
    }
  ],
  "video_slug": "<string>",
  "image_slug": "<string>"
}'

{
  "cart": 123456
}