Differentiate between button pressed and button released in button part

[FWeinb]

I noticed that currently the button part only exposes an event when the button is clicked. I am currently exploring the integration of Lego Powered Up Hubs and would like to build a little remote control inside kano-code. For that to work I would need to distinguish between a button press and a button release.

I could eventually create a PR to add this functionality but would first like to know if you are willing to support this.