Creates a standalone Kubernetes Gateway using GCP Load Balancers.
This does not route traffic to any backends. Use capabilities and other blocks to route traffic from this Gateway to a backend.
This module creates a Gateway that is listening via HTTPS:443 on the public internet through a newly-created static IP address.
In order to support this, this module requires a certificate-map connection that contains a GCP Certificate Map.
While the Certificate Map must exist at creation of this Gateway, additional SSL Certificates may be added to the Certificate Map after the Gateway is created.