[Feature request] Add onPress and contextual menu on event

[alerena]

It would be great if, instead to create a custom template, this component had an "onPress" event, specially for mobile and a "contextMenu" event when the right click is trigger.

If it's not a problem or a WIP, I can do this feature and then do a pull request.

[twinssbc]

@alerena
As far as I know, to support press/tap action requires an external library, hammerjs.
But because of some issue, Ionic doesn't officially support it. So I try not to include some unstable dependency.
https://forum.ionicframework.com/t/solved-ionic-4-press-tap-events/144385/10