LibJS: Add the Temporal.now namespace object

This will be home to various functions:

- Temporal.now.timeZone()
- Temporal.now.instant()
- Temporal.now.plainDateTime()
- Temporal.now.plainDateTimeISO()
- Temporal.now.zonedDateTime()
- Temporal.now.zonedDateTimeISO()
- Temporal.now.plainDate()
- Temporal.now.plainDateISO()
- Temporal.now.plainTimeISO()

Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/Now.h>
+
+namespace JS::Temporal {
+
+// 2 The Temporal.now Object, https://tc39.es/proposal-temporal/#sec-temporal-now-object
+Now::Now(GlobalObject& global_object)
+    : Object(*global_object.object_prototype())
+{
+}
+
+void Now::initialize(GlobalObject& global_object)
+{
+    Object::initialize(global_object);
+}
+
+}