Add support for reserved internal ranges to google_compute_subnetwork

[caveman8fb]

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Description

Add the reserved-internal-range option to google_compute_subnetwork to support using an ip_cidr from google_network_connectivity_internal_range.

This would allow a subnet to be created with a automatically assigned subnet from the target_cidr_range by prefix_length

New or Affected Resource(s)

google_compute_subnetwork

Potential Terraform Configuration

resource "google_compute_subnetwork" "subnet" {
  name                    = "test-subnetwork"
  reserved-internal-range = google_network_connectivity_internal_range.default.id
  region                  = "us-central1"
  network                 = google_compute_network.vpc.id
}

resource "google_compute_network" "vpc" {
  name                    = "internal-ranges-vpc"
  auto_create_subnetworks = false
}

resource "google_network_connectivity_internal_range" "default" {
  name          = "automatic-reservation"
  network       = google_compute_network.vpc.id
  usage         = "FOR_VPC"
  peering       = "FOR_SELF"
  prefix_length = 24
  target_cidr_range = [
    "192.168.128.0/18"
  ]
}

References

https://cloud.google.com/vpc/docs/create-use-internal-ranges#create-subnet-partial-range

[caveman8fb]

Duplicate of #17881

[github-actions]

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