Add support for triggering XWiki's custom Prototype.js events from jQuery

We have JavaScript widgets that have been written using Prototype.js and which listen to custom events. For instance the date picker listens to the xwiki:dom:updated event and re-initializes the date text input elements that have been replaced. Rewriting all these widgets with something based on jQuery (or a full fledged framework) is a lengthy process and until it's done we should be able to trigger these events from jQuery code.

require(['jquery', 'xwiki-events-bridge'], function($) {
  $(document).trigger('xwiki:dom:updated', {'elements': $('.some-container').toArray()});
});