Support for passing provider for `dns_zone_name`

[jsbroks]

Our DNS zone lives in a different gcp project then where we would like to deploy tfe. This means we need a different provider when querying for the dns zone.

Is it possible to add support for this?

[aaron-lane]

Hi @jsbroks! That seems like a feature that we could add fairly easily. 🎉

Alternatively, given that the google_dns_record_set resources created by the different load balancer submodules are not depended on by any other resources within the module, would it be preferable if we removed those record sets and instead output the FQDN and IP address that are currently passed to them, allowing greater flexibility for the caller to manage the DNS resources? 🤔