Time zone support for CloudSQL SQL Server (#2107)

* time zone for SQL Server

* removed nl

* fix line

modules/cloudsql-instance/variables.tf

@@ -260,6 +260,12 @@ variable "tier" {
   type        = string
 }
 
+variable "time_zone" {
+  description = "The time_zone to be used by the database engine (supported only for SQL Server), in SQL Server timezone format."
+  type        = string
+  default     = null
+}
+
 variable "users" {
   description = "Map of users to create in the primary instance (and replicated to other replicas). For MySQL, anything after the first `@` (if present) will be used as the user's host. Set PASSWORD to null if you want to get an autogenerated password. The user types available are: 'BUILT_IN', 'CLOUD_IAM_USER' or 'CLOUD_IAM_SERVICE_ACCOUNT'."
   type = map(object({