Generic async handler for every AfDal*Data supported service request response.
While performing asynchronous request, user space code must provide a callback where received response will be notified.
Because this handler defines a gpointer as AfDal data, it accepts AfDalNulData, AfDalSimpleData, AfDalData, etc.
This handler is mainly used to implement generic politics to received responses.
This callback notifiers depends on the request type type.