Allow custom names and descriptions for load balancer components (#3223)

* feat: Changes for migrating resources to GLB module

* Updated Readme

* Added support for null description

* Added support for empty string

* Added default optional values

* Changed Readme

* Corrected description according to readme

* Added name and description changes for net-lb-app-ext-regional

* Added name and description changes for net-lb-app-int

* Added name and description changes for net-lb-app-int-cross-region

* Added name and description changes for net-lb-proxy-int

* Added name and description changes for net-lb-ext

* Added name and description changes for net-lb-int

* Changed Readme docs

modules/net-lb-app-ext/urlmap.tf

@@ -27,7 +27,7 @@ resource "google_compute_url_map" "default" {
   provider    = google-beta
   project     = var.project_id
   name        = var.name
-  description = var.description
+  description = var.urlmap_config.description
   default_service = (
     var.urlmap_config.default_service == null ? null : lookup(
       local.backend_ids,