Add event:selectionchange Wrapper

[softmarshmallow]

the event selectionchange behaves all different by design platforms.

I.e. on figma, when editing a text value, selectionchange gets invoked every type sequence.
We'll have to make a new event called unique_selectionchange for general purpose, the logic will have arguments [time, id].
So it can prevent duplicated event invoke, measured by time diff and id.