Create the symfony layout Twig component

[fabienvallon]

Description

Once all the components are available we can create the symfony layout in twig that includes all the new components, it is based on admin-dev/themes/new-theme/template/layout.tpl but probably a lot of variables can be renamed or fixed and some blocks can be removed

It should follow the same principle as the twig components, meaning it's based on a Twig component. We need two layouts:

• a "normal" one that includes the menu and all the side elements
• a "light" one that is used with all the components around and is used to display content in modals for example (it is based on the liteDisplaying query parameter so far, but this should be improved as well Maybe this could be made automatic via a listener that automatically switches the layout when a query parameter or an attribute is set on the Request (or it could be handled via a LayoutBuilder::layout variable maybe

Blocked by #33101

• Create the global Twig component with default layout from smarty being extracted into a twig one
• Make this twig component independent via DI