Purpose is to have more detailed information given back when calling new_page.
Now each new record adds its entry in returned result:
* view_id: new ir.ui.view created. As there is always a view (based on a
template) it is now always set, and not only when creating a page;
* page_id: set if ispage is true, ID of website.page created;
* menu_id: set if add_menu is true, ID of website.menu created;
Previously only view_id was returned when creating a page which can be a
limitation notably in website_event.
Task-2577079
PR odoo/odoo#72411