[FEAT] - Add keyboard events, onOpen and onClose

[mussacharles60]

I don't know when the keyboard is opened or closed

I would like to know when a keyboard is fucussed or not, eg: on init or run functions should have the onOpen and onClose callbacks
for better experience

For example:

KioskBoard.init({
     // some codes,
    onOpen: () => {
      // keyboard opened
    },
    onClose: () => {
      // keyboard closed
    }
});

Or

KioskBoard.run('.js-kioskboard-input', {
    // some codes,
    onOpen: () => {
      // keyboard opened
    },
    onClose: () => {
      // keyboard closed
    }
});