public interface TypeExtensionActionHandler
The extension handler interface will enable template type extension during deployment.
This class will not get any AssetObject in it. It will get the template type and class as parameter
and will return a list of extension properties in the map. It is expected that
preprocessor implementation of this interface will provide all the extended properties in the passed map with key
as TypeExtensionActionHandler.TYPE_EXTENSION_KEY. If there are multiple handlers that are adding properties
then they should keep on adding their properties to the List if it is already there in the map.