Feature: Add support for Address Autocomplete via Google Maps API.

[andrewlimaza]

Now that Google Maps logic has been integrated into the Membership Directory, we can utilize "other" features of Google Maps API such as Address Autocompletion.

Site owners need to enable API keys and access for Google Maps, this would be another feature within the same credentials to enable and it can just work once it's enabled or silently ignore this feature if the API key fails to return a successful response as not all sites will need or want to enable this.

Reference: https://developers.google.com/maps/documentation/javascript/legacy/place-autocomplete