Add object arguments form for combineEvents

[sergeysova]

Should support config normalization

const event = combineEvents({
  events: { event1, event2, event3 }
});

[doasync]

How are you going to differentiate if the object (first param) is source or config?

[sergeysova]

I want to remove the support of the previous configuration.
Leave just one — object form combineEvents({ events: {} })

[doasync]

Seems reasonable for combineEvents, as there is a need for reset and target options