Add labels support when adding fields (#9333)

docs/content/develop/add-handwritten-datasource.md

@@ -22,6 +22,8 @@ a new datasource there are 5 steps to doing so.
 
 1. Create a new datasource declaration file and a corresponding test file
 1. Add Schema and Read operation implementation
+   - If there is `labels` field with type `KeyValueLabels` in the corresponding resource, in the datasource Read operation implementation, after the resource read method, call the function `tpgresource.SetDataSourceLabels(d)` to make `labels` and `terraform_labels` have all of the labels on the resource.
+   - If there is `annotations` field with type `KeyValueAnnotations` in the corresponding resource, in the datasource Read operation implementation, after the resource read method, call the function `tpgresource.SetDataSourceAnnotations(d)` to make `annotations` have all of the annotations on the resource.
 1. Add the datasource to the `provider.go.erb` index
 1. Implement a test which will create and resources and read the corresponding
   datasource

docs/content/develop/resource.md

@@ -223,6 +223,8 @@ For more information about types of resources and the generation process overall
 ```yaml
 # Supported types: String, Integer, Boolean, Double, Enum,
 # ResourceRef (link to a GCP resource), KeyValuePairs (string -> string map),
+# KeyValueLabels (for standard resource 'labels' field),
+# KeyValueAnnotations (for standard resource 'annotations' field)
 # Array, and NestedObject
 - !ruby/object:Api::Type::String
   name: 'API_FIELD_NAME'