Add new paradigm classes for notification and introduction notifications

- Add support for bounded select in BaseDepository

src/Navigation/Notifications/Collection/Notifications.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Navigation\Notifications\Collection;
+
+use Friendica\BaseCollection;
+use Friendica\Navigation\Notifications\Entity;
+
+class Notifications extends BaseCollection
+{
+	/**
+	 * @return Entity\Notification
+	 */
+	public function current(): Entity\Notification
+	{
+		return parent::current();
+	}
+
+	public function setSeen(): Notifications
+	{
+		return $this->map(function (Entity\Notification $Notification) {
+			$Notification->setSeen();
+		});
+	}
+}