Progress modal

[tmarsik42]

I've been going through the Carbon Design System documentation and came across the Progress Modal section. The design implementation there seems quite useful (though I'm not sure if it's specific to Carbon v11).

Personally, I find progress modals quite handy and having a straightforward API to switch between modal types would be a great addition. Currently, we have danger and passive modal props. I've been using the option described here, but it does have its drawbacks. For instance, having two secondary buttons for similar actions (both essentially dismiss) might confuse users.