Changes to List functions

added the new VARIANT enum value to the functions/items/data_type response property for the response status 200

added the new VARIANT enum value to the functions/items/input_params/parameters/items/type_name response property for the response status 200

added the new VARIANT enum value to the functions/items/return_params/parameters/items/type_name response property for the response status 200

added the optional property functions/items/created_by to the response with the 200 status

added the optional property functions/items/owner to the response with the 200 status

added the optional property functions/items/updated_by to the response with the 200 status