Add close event to Dialog

[arjunyel]

I believe that I should be able to do an inline event listener for the close event. Example is the returning value from dialog section https://demo.agektmr.com/dialog/ https://html.spec.whatwg.org/multipage/interactive-elements.html#the-dialog-element

[adamdbradley]

We can't merge changed JSX yet until we update how h is imported. Once we get that updated we'll be able to merge this.