Executes the server-side EventResize event using an AJAX callback.
eventResizeCallBack(e, newStart, newEnd, data)
e (DayPilot.Event) - event reference
newStart (DayPilot.Date) - new event start
newEnd (DayPilot.Date) - new event end
newResource (string) - new resource id
data (object) - custom data to be sent to the server-side event handler