List shipping regions

curl --request GET \
  --url https://staging-api.covver.io/api/ext/v1/shipping-regions

{
  "countryName": "United States",
  "countryCode": "US",
  "isBlacklisted": false,
  "provinces": [
    {
      "provinceName": "California",
      "provinceCode": "CA"
    }
  ]
}