Feature request: let users choose when dialog closes

[brmscheiner]

The <Dialog> component currently has the following behavior:

onClose: Called when the Dialog is dismissed (via outside click of the DialogPanel or by pressing the Esc key). Typically used to close the dialog by setting open to false.

It should be possible to choose whether onClose is called for outside clicks or escape key presses, since both may not be desired. The workaround is to do something like onClose={() => {}} and reimplement the escape key listener in the client app.

Note that this behavior can be easily achieved with other component library APIs, eg. material.

Two new props like closeOnPanelClick and closeOnEscape (both defaulting to true) would do the trick.