[WebEngine] Support frame printing with QPrintPreviewDialog

It’s currently possible to print web view using QWebEngineView and QPrintPreviewDialog like shown with the PrintMe Example (https://doc.qt.io/qt-6/qtwebengine-webenginewidgets-printme-example.html)

The simplified flow there is:

QWebEngineView::printRequested + QPrintPreviewDialog + QWebEngineView::print

Would it be possible to add similar functionality with the support to print frames, e.g. something like:

QWebEngineView::printRequestedByFrame + QPrintPreviewDialog + new API for frame printing