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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
#include "shell/browser/api/electron_api_ontents.h"
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "base/message_loop/message_loop_current.h"
#include "base/no_destructor.h"
#include "base/optional.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/ssl/security_state_tab_helper.h"
#include "content/browser/frame_host/frame_tree_node.h"             
#include "content/browser/frame_host/render_frame_host_manager.h"   
#include "content/browser/renderer_host/render_widget_host_impl.h"  
#include "content/browser/renderer_host/render_widget_host_view_base.h"  
#include "content/common/widget_messages.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/download_request_utils.h"