LibJS: Add a barebones Module class

This corresponds to the "Abstract Module Record" from the spec.

Userland/Libraries/LibJS/Module.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Module.h>
+
+namespace JS {
+
+Module::Module(Realm& realm)
+    : m_vm(realm.vm())
+    , m_realm(make_handle(&realm))
+{
+}
+
+Module::~Module()
+{
+}
+
+}