Add autoclass to GCS (#1757)

* Add autoclass to GCS

* Fix linting

* Make autoclass block dynamic

* Fix syntax

---------

Co-authored-by: Julio Castillo <jccb@google.com>

modules/gcs/variables.tf

@@ -1,5 +1,5 @@
 /**
- * Copyright 2022 Google LLC
+ * Copyright 2023 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,6 +14,12 @@
  * limitations under the License.
  */
 
+variable "autoclass" {
+  description = "Enable autoclass to automatically transition objects to appropriate storage classes based on their access pattern. If set to true, storage_class must be set to STANDARD. Defaults to false."
+  type        = bool
+  default     = false
+}
+
 variable "cors" {
   description = "CORS configuration for the bucket. Defaults to null."
   type = object({