Add a UI for viewing deleted entities.

src/Controller/TrashController.php

src/Entity/Query/QueryTrait.php

src/Plugin/Derivative/TrashLocalTasks.php

src/TrashManager.php

src/TrashManagerInterface.php

src/ViewsQueryAlter.php

trash.info.yml

trash.links.task.yml

trash.permissions.yml

trash.routing.yml

trash.services.yml