feat: #3046958 Added views area plugin to render site settings by bundle.

Adds a new Views “area” plugin that can render Site Settings entities filtered by a chosen bundle (machine name) in a view’s header/footer. The area exposes options to pick the bundle via autocomplete, choose a view mode (refreshed via AJAX when the bundle changes), and optionally bypass entity access checks when rendering. Rendering loads all entities of the selected bundle and builds their render arrays using the chosen view mode, with cache tags tied to that bundle’s entity list. It also registers the new area handler in Views and declares a configuration dependency on the selected bundle so exported view configuration stays portable across environments.