Add support for Geocoding API

It looks like support and bug fixes for built-in geocoding, for accessing current_weather via city names and zip codes has been deprecated. [https://openweathermap.org/current#geocoding](url)

The Geocoding API is the currently supported method from Open Weather for converting city names and zip codes to geo-locations. [https://openweathermap.org/api/geocoding-api](url)