Is your feature request related to a problem? Please describe...

I am looking for a way to be able to trigger a callback when a <b-overlay /> is clicked. This is useful when using the overlay to cover the entire screen to have the user focus on a specific piece of content.

Describe the solution you'd like

I would like to be able to add a click handler to the overlay using @click="...".

<b-overlay
    @click="closeOverlay"
>
    ...
</b-overlay>

Describe alternatives you've considered

I've considered adding a close button to the content shown in the overlay, however it is a common UX pattern to allow a user to close an overlay by clicking on the shaded portion.

Additional context

I'm new to Vue so adding such a click handler may already be supported without changes to the library. Please let me know if this is possible, thanks :).