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

tests/modules/net_lb_app_ext/examples/http-https-redirect.yaml

@@ -52,7 +52,7 @@ values:
       prefix_redirect: null
       redirect_response_code: MOVED_PERMANENTLY_DEFAULT
       strip_query: false
-    description: Terraform managed.
+    description: URL redirect for glb-test-0.
     header_action: []
     host_rule: []
     name: glb-test-0-redirect