Feature request: add an event handler on event source received

[Zaimwa9]

Problem

At the moment the SDK provides realtime capabilities through eventSourceUrl and realtime init parameters but it doesn't expose a specific handler when a new event is received.
To add custom logic, it requires to setup the event-source manually

Solution

A solution could be to add a new handler onEventSourceReceived that would be triggered when a new event is received to allow for additional logic independently from onChange