Improve GCP Integration : GCP HTTPS Load balancer

[blop]

To allow offloading the SSL handling and configurations to GCP, it would be nice to add some support for :

• Google HTTPS Load balancer (in place of the TCP load balancer) : https://cloud.google.com/load-balancing/docs/https/setting-up-https

Big plus : This would also allow compatibility with Google Cloud CDN (which is basically an extra option set on the GCP HTTP(S) loadbalancer) : https://cloud.google.com/cdn/docs/

• Google managed certificates : https://cloud.google.com/load-balancing/docs/ssl-certificates#managed-certs

[sudomann]

Absence of this, for the reasons you mentioned, plus not being able to use Global anycast IP are why my team ended up not using Voyager's Ingress :(