Issue #2012916 by andypost: Implement access controller for the menu and menu link entity.

...les/menu/lib/Drupal/menu/Access/DeleteLinkAccessCheck.php

...les/menu/lib/Drupal/menu/Access/DeleteMenuAccessCheck.php

core/modules/menu/lib/Drupal/menu/MenuFormController.php

core/modules/menu/lib/Drupal/menu/MenuListController.php

core/modules/menu/menu.admin.inc

core/modules/menu/menu.routing.yml

core/modules/menu/menu.services.yml

...nu_link/lib/Drupal/menu_link/MenuLinkAccessController.php

...menu_link/lib/Drupal/menu_link/MenuLinkFormController.php

...link/lib/Drupal/menu_link/Plugin/Core/Entity/MenuLink.php

...modules/system/lib/Drupal/system/MenuAccessController.php

...ules/system/lib/Drupal/system/Plugin/Core/Entity/Menu.php