Support address_country and address_zone field types

Now when we have basic tests, we can implement support for additional field types.

I've added support for the address_country field type, it already merged to 1.4.x.
As for address_zone, there's an open MR adding support and it works, but needs tests before we could merge it.

The test is here, merged to 1.4.x.

Automatically closed - issue fixed for 2 weeks with no activity.