Extensions shouldnt inherit from Operation

1. Create OperationAndOperationExtensionBase class with get_name and get_name_with_sufix_functions
2. Inherit Operation class from OperationAndOperationExtensionBase and extend functions with
   "offset"
3. Create OperationExtension(name same as in previous version of
   schemas), which is an alias of OperationAndOperationExtensionBase class.