feat(trashbin): Add deleted by properties

Signed-off-by: Christopher Ng <chrng8@gmail.com>

apps/files_trashbin/lib/Sabre/TrashbinPlugin.php

 	public const TRASHBIN_ORIGINAL_LOCATION = '{http://nextcloud.org/ns}trashbin-original-location';
 	public const TRASHBIN_DELETION_TIME = '{http://nextcloud.org/ns}trashbin-deletion-time';
 	public const TRASHBIN_TITLE = '{http://nextcloud.org/ns}trashbin-title';
+	public const TRASHBIN_DELETED_BY_ID = '{http://nextcloud.org/ns}trashbin-deleted-by-id';
+	public const TRASHBIN_DELETED_BY_DISPLAY_NAME = '{http://nextcloud.org/ns}trashbin-deleted-by-display-name';
 
 	/** @var Server */
 	private $server;
 			return $node->getDeletionTime();
 		});
 
+		$propFind->handle(self::TRASHBIN_DELETED_BY_ID, function () use ($node) {
+			return $node->getDeletedBy()?->getUID();
+		});
+
+		$propFind->handle(self::TRASHBIN_DELETED_BY_DISPLAY_NAME, function () use ($node) {
+			return $node->getDeletedBy()?->getDisplayName();
+		});
+
 		$propFind->handle(FilesPlugin::SIZE_PROPERTYNAME, function () use ($node) {
 			return $node->getSize();
 		});