No handler for determining visibility of elements that never change visibility

### Problem
Assume having a list of elements that should be checked in the interval but are in the middle of a scroll container so the visibility will never change. That won't trigger the `onChange` handler.
But the use case of the application won't allow to expect that the element is visible from beginning (so we could check at render) and a callback needs to be called when it is visible for a certain time. The callback could not be called in the render method because it affects the performance and should be called when the check is done.
Such a handler is not implemented.

### Suggestion
Introduce a `onCheck` prop where a callback can be registered that is called after a check is done (with the `isVisible`, even if it didn't change).