[Feature Request] Add support for google_compute_router_nat_address to improve NAT IPs lifecycle handling

[Byh0ki]

TL;DR

The google TF provider has a compute_router_nat_address resource that handles the NAT IPs lifecycle automatically for a given compute_router_nat instance. It could be nice to provide this as an option alongside the already existing nat_ips & drain_nat_ips parameters in the nats object.

Terraform Resources

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/compute_router_nat_address

Detailed design

Design remains open to discussion but the idea would be to give the user a flag to either enable or disable the `compute_router_nat_address` usage when the `nat_ip_allocate_option` is set or defaults to `MANUAL_ONLY`. If the flag is `true`, we would then use the `initial_nat_ips` parameters in the `google_compute_router_nat` resource instead of `nat_ips` & `drain_nat_ips` and add an additional `google_compute_router_nat_address` bloc. A great example is available in the resource documentation page.

Additional information

No response