feat(drawer): add support for title, header-actions and footer slots

[hyyan]

@MatthewHawkins please update the drawer docs, the PR:

1. Remove style methods (setSize and setMaxWidth). Css variables must be used for this (Keep the current docs, just explain the way to do it in css variables)
2. Add support for the title, header-actions and footer slots

public class DrawerDemo extends App {

  Drawer drawer = new Drawer("Drawer");
  Element title = new Element("p", "This is a Drawer component!");
  Button button = new Button("Click me!");

  @Override
  public void run() throws DwcjException {

    Frame app = new Frame();
    app.add(drawer);

    drawer.open();
    drawer.add(title);
    drawer.addToFooter(button.setTheme(ButtonTheme.PRIMARY));
  }
}

[sonarcloud]

Quality Gate passed

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