LookupExtension looks up for the [Maker] interface on the resource extension.

NewResource initializes and returns a new instance of Resource with typed spec field.

Resource provides a generic base implementation for resource.Resource.

DeepCopyable requires a spec to have DeepCopy method which will be used during Resource copy.

Extension is a phantom type which acts as info supplier for ResourceDefinition methods.

Maker is an interface which can be implemented by resource extension to provide custom interfaces.