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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem Description
<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->

They is no way to choose the paper format (A4, A3, Letter, ...) when printing with `webContents.print()`.

### Proposed Solution
<!-- Describe the solution you'd like in a clear and concise manner -->

Add something like the `pageSize` option which is available in [`webContents.printToPDF()`](https://electronjs.org/docs/api/web-contents#contentsprinttopdfoptions-callback).

shell/browser/api/electron_api_web_contents.cc
if (managed_ontents()) {
    managed_ontents()->GetView()->SetDelegate(nullptr);
    RenderViewDeleted(ontents()->GetRenderViewHost());
    if (type_ == Type::BROWSER_WINDOW && owner_window()) {
      
      
      for (ExtendedWsObserver& observer : observers_)
        observer.OnCloseContents();
      
      
      WsDestroyed();
    } else if (Browser::Get()->is_shutting_down()) {
      
      DestroyWs(false );
    } else {
      
      
      DestroyWs(!IsGuest() );
      
      
      
      WsDestroyed();
    }
  }
}
void Ws::DestroyWs(bool async) {