pass props to child slides to know if they are currently visible?

### Guidelines for posting a new issue

* Please replicate your issue with this [CodeSandBox](https://codesandbox.io/s/ppwkk5l6xx) and provide a link to it along with the issue description

https://dequeuniversity.com/rules/axe/3.4/aria-hidden-focus?application=AxeChrome

I believe that if the slides were able to know if they were currently visible, they could address this issue by making themselves not focusable.

`