feat: add gcp dns-zone module

Signed-off-by: Max Xu <[email protected]>

modules/gcp/dns-zone/README.md

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+# DNS Module
+
+To create a zone in the sub project and then create the delegations in the parent project.
+
+# Quickstart
+
+```hcl
+module "gcp-dns-zone" {
+  source = "github.com/streamnative/terraform-managed-cloud//modules/gcp/dns-zone"
+
+  parent_project = "<input-here>"
+  sub_project = "<input-here>"
+
+  parent_zone_name = "<input-here>"
+  sub_zone_name = "<input-here>"
+  sub_zone_dns_name = "<input-here>"
+}
+```
+<!-- BEGIN_TF_DOCS -->
+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >=1.2.0 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_google.parent"></a> [google.parent](#provider\_google.parent) | n/a |
+| <a name="provider_google.sub"></a> [google.sub](#provider\_google.sub) | n/a |
+
+## Modules
+
+No modules.
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [google_dns_managed_zone.sub](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/dns_managed_zone) | resource |
+| [google_dns_record_set.delegate](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/dns_record_set) | resource |
+| [google_dns_managed_zone.parent](https://registry.terraform.io/providers/hashicorp/google/latest/docs/data-sources/dns_managed_zone) | data source |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_parent_project"></a> [parent\_project](#input\_parent\_project) | The parent gcp project in which holds the paren zone | `string` | n/a | yes |
+| <a name="input_parent_zone_name"></a> [parent\_zone\_name](#input\_parent\_zone\_name) | The parent zone in which we create the delegation records | `string` | n/a | yes |
+| <a name="input_sub_project"></a> [sub\_project](#input\_sub\_project) | The sub project in which holds the new zone | `string` | n/a | yes |
+| <a name="input_sub_zone_dns_name"></a> [sub\_zone\_dns\_name](#input\_sub\_zone\_dns\_name) | The new dns name | `string` | n/a | yes |
+| <a name="input_sub_zone_name"></a> [sub\_zone\_name](#input\_sub\_zone\_name) | The new zone name | `string` | n/a | yes |
+
+## Outputs
+
+No outputs.
+<!-- END_TF_DOCS -->

modules/gcp/dns-zone/main.tf

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+provider "google" {
+  alias = "parent"
+
+  project = var.parent_project
+}
+
+provider "google" {
+  alias = "sub"
+
+  project = var.sub_project
+}
+
+resource "google_dns_managed_zone" "sub" {
+  provider = google.sub
+
+  name     = var.sub_zone_name
+  dns_name = var.sub_zone_dns_name
+}
+
+data "google_dns_managed_zone" "parent" {
+  provider = google.parent
+
+  name  = var.parent_zone_name
+}
+
+resource "google_dns_record_set" "delegate" {
+  provider = google.parent
+
+  managed_zone = data.google_dns_managed_zone.parent.name
+  name         = google_dns_managed_zone.sub.dns_name
+  type         = "NS"
+  ttl          = "300"
+  rrdatas      = google_dns_managed_zone.sub.name_servers
+}

modules/gcp/dns-zone/variables.tf

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+variable "parent_project" {
+  type        = string
+  description = "The parent gcp project in which holds the paren zone"
+}
+
+variable "sub_project" {
+  type        = string
+  description = "The sub project in which holds the new zone"
+}
+
+variable "parent_zone_name" {
+  type        = string
+  description = "The parent zone in which we create the delegation records"
+}
+
+variable "sub_zone_name" {
+  type        = string
+  description = "The new zone name"
+}
+
+variable "sub_zone_dns_name" {
+  type        = string
+  description = "The new dns name"
+
+  validation {
+    condition = endswith(var.sub_zone_dns_name, ".")
+    error_message = "DNS name must end with '.'"
+  }
+}

modules/gcp/dns-zone/versions.tf

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+terraform {
+  required_version = ">=1.2.0"
+
+  required_providers {
+    google = {
+      source = "hashicorp/google"
+    }
+  }
+}