feat(jsx): add close event to Dialog (#1348)

* Add close event to Dialog

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

* Update jsx.ts

Author: arjunyel

src/declarations/jsx.ts

@@ -261,6 +261,7 @@ export namespace JSXBase {
   }
 
   export interface DialogHTMLAttributes<T> extends HTMLAttributes<T> {
+    onClose?: (event: Event) => void;
     open?: boolean;
     returnValue?: string;
   }