[V] $parentResource
const $parentResource: ParentResourceDecorator;@parentResource marks a model with a reference to its parent resource type
The first argument should be a reference to a model type which will be treated as the parent
type of the target model type. This will cause the @key properties of all parent types of
the target type to show up in operations of the Resource*<T> interfaces defined in this library.
@parentResource can only be applied to models.