QuickSettings: Provide a small test app to run QuickSettings

It's useful to limit what you are testing.

components/mobileshell/qml/actiondrawer/quicksettings/QuickSettingsTest.qml

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+/*
+ *   SPDX-FileCopyrightText: 2022 Aleix Pol Gonzalez <aleixpol@kde.org>
+ *
+ *   SPDX-License-Identifier: LGPL-2.0-or-later
+ */
+
+import QtQuick 2.15
+
+import org.kde.plasma.components 3.0 as PlasmaComponents
+import org.kde.plasma.core 2.0 as PlasmaCore
+import org.kde.plasma.private.mobileshell 1.0 as MobileShell
+import "../../components" as Components
+
+// This is a test app to conveniently test the Quick Settings that are available
+// on the system without having to load a full Plasma Mobile shell.
+//
+// Do not expect changes in this file to change the plasma UX. Do not install.
+//
+// This can be executed by running `qml QuickSettingsTest.qml`
+
+GridView {
+    model: MobileShell.QuickSettingsModel {}
+
+    PlasmaComponents.Button {
+        id: restrictedButton
+        checkable: true
+        text: "Restricted"
+    }
+    delegate: Components.BaseItem {
+        required property var modelData
+
+        implicitHeight: 150
+        implicitWidth: 150
+        horizontalPadding: (width - PlasmaCore.Units.gridUnit * 3) / 2
+        verticalPadding: (height - PlasmaCore.Units.gridUnit * 3) / 2
+
+        contentItem: QuickSettingsFullDelegate {
+            restrictedPermissions: restrictedButton.checked
+
+            text: modelData.text
+            status: modelData.status
+            icon: modelData.icon
+            enabled: modelData.enabled
+            settingsCommand: modelData.settingsCommand
+            toggleFunction: modelData.toggle
+
+            onCloseRequested: {
+                actionDrawer.close();
+            }
+        }
+    }
+}