Provide a mechanism to have specialized dispatchers #12
Description
Depends on #11
It might be useful to have a way to extend dispatchers. That way we could override their pre-hook to provide better handling on special cases.
Eg: Dispatcher A defines several events, Dispatcher B extends it with an specialized pre-hook that stores on an external service each event (that way with a simple switch you can log certain events)
Eg: Dispatcher A defines several events, Dispatcher B extends it by providing additional event handlers, that way a certain part of the application can only emit Set<[A]> while another part can emit Set<[A, X]> (being X the new events/handlers provided by B)
That also allows complementary behaviours on certain environments (eg: additional logging step on test) etc