Allow additional typed properties on TourGuideZone in addtion to text

[pke]

Would be nice to be able to add more texts to a zone, which could then be read by a custom tooltip.
It could even be made typesafe:

type MyZone = {
  title: string,
  image: string,
}

function ToolTip<MyZone>({ title, text, image }) {
}

<TourGuideProvider tooltipComponent={ToolTip}/>
<TourGuideZone<MyZone> title="Title" />