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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.
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* [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
auto result = SessionPreferences::GetValidPreloads(GetBrowserContext());
  if (auto* web_preferences = WsPreferences::From(ontents())) {
    base::FilePath::StringType preload;
    if (web_preferences->GetPreloadPath(&preload)) {
      result.emplace_back(preload);
    }
  }
  return result;
}
v8::Local<v8::Value> Ws::GetWebPreferences(
    v8::Isolate* isolate) const {
  auto* web_preferences = WsPreferences::From(ontents());
  if (!web_preferences)
    return v8::Null(isolate);
  return gin::ConvertToV8(isolate, *web_preferences->preference());
}
v8::Local<v8::Value> Ws::GetLastWebPreferences(
    v8::Isolate* isolate) const {
  auto* web_preferences = WsPreferences::From(ontents());
  if (!web_preferences)
    return v8::Null(isolate);
  return gin::ConvertToV8(isolate, *web_preferences->last_preference());
}
v8::Local<v8::Value> Ws::GetOwnerBrowserWindow() const {
  if (owner_window())
    return BrowserWindow::From(isolate(), owner_window());
  else
    return v8::Null(isolate());
}
int32_t Ws::ID() const {