Enable Private Path for Google Cloud Services for CloudSQL module

[fulyagonultas]

Add attribute enable_private_path_for_google_cloud_services to the folllowing resource to make it possible to use Bigquery's running federated wueries against CloudSQL:

resource "google_sql_database_instance" "primary" {
  provider            = google-beta
  project             = var.project_id
  name                = "${local.prefix}${var.name}"
  region              = var.region
  database_version    = var.database_version
  encryption_key_name = var.encryption_key_name
  root_password       = var.root_password

  settings {
    tier                        = var.tier
    edition                     = var.edition
    deletion_protection_enabled = var.gcp_deletion_protection
    disk_autoresize             = var.disk_size == null
    disk_autoresize_limit       = var.disk_autoresize_limit
    disk_size                   = var.disk_size
    disk_type                   = var.disk_type
    availability_type           = var.availability_type
    user_labels                 = var.labels
    activation_policy           = var.activation_policy
    collation                   = var.collation
    connector_enforcement       = var.connector_enforcement
    time_zone                   = var.time_zone

    ip_configuration {
      ipv4_enabled       = var.network_config.connectivity.public_ipv4
      private_network    = try(var.network_config.connectivity.psa_config.private_network, null)
      allocated_ip_range = try(var.network_config.connectivity.psa_config.allocated_ip_ranges.primary, null)
      ssl_mode           = var.ssl.ssl_mode
      **enable_private_path_for_google_cloud_services = var.network_config.connectivity.enable_private_path_for_google_cloud_services** 

[juliocc]

This is a pretty straightforward change. Can you send a PR and we'll help you getting it merged?

[fulyagonultas]

sure! please review #2726