List Countries

curl --request GET \
  --url https://api.geocoders.io/countries \
  --header 'X-Api-Key: <api-key>'

[
  {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "country_code": "<string>",
    "alt_name": "<string>",
    "local_identifier": "<string>"
  }
]