[FR] Allow code block processor output cause an update to the markdownPostProcessor

Devs: Plugins & API
1

Result DOM from handling code block processor can be seen in the view update handler but not in the markdown post processor handler. I think it should.

this.registerEditorExtension(
  // Here `dom` contains result of code block processing handler
  EditorView.updateListener.of((update) => update.view.dom) 
);

// Here the callback is not invoked with the result of code block processing handler
this.registerMarkdownPostProcessor((element, c) => element );

My plugin needs to see the resulting HTML.