LibJS: Add the Temporal namespace object :^)

Currently empty, but we gotta start somewhere! This is the start of
implementing the Temporal proposal (currently stage 3).

I have decided to start a new subdirectory (Runtime/Temporal/) as well
as a new C++ namespace (JS::Temporal) for this so we don't have to
prefix all the files and classes with "Temporal" - there will be a lot.

https://tc39.es/proposal-temporal/

Userland/Libraries/LibJS/CMakeLists.txt

@@ -121,6 +121,7 @@ set(SOURCES
     Runtime/SymbolConstructor.cpp
     Runtime/SymbolObject.cpp
     Runtime/SymbolPrototype.cpp
+    Runtime/Temporal/Temporal.cpp
     Runtime/TypedArray.cpp
     Runtime/TypedArrayConstructor.cpp
     Runtime/TypedArrayPrototype.cpp

Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h

@@ -46,6 +46,7 @@ namespace JS {
     P(SQRT2)                                 \
     P(String)                                \
     P(Symbol)                                \
+    P(Temporal)                              \
     P(UTC)                                   \
     P(abs)                                   \
     P(acos)                                  \

Userland/Libraries/LibJS/Runtime/GlobalObject.cpp

@@ -67,6 +67,7 @@
 #include <LibJS/Runtime/StringPrototype.h>
 #include <LibJS/Runtime/SymbolConstructor.h>
 #include <LibJS/Runtime/SymbolPrototype.h>
+#include <LibJS/Runtime/Temporal/Temporal.h>
 #include <LibJS/Runtime/TypedArray.h>
 #include <LibJS/Runtime/TypedArrayConstructor.h>
 #include <LibJS/Runtime/TypedArrayPrototype.h>
@@ -170,6 +171,7 @@ void GlobalObject::initialize_global_object()
     define_direct_property(vm.names.Math, heap().allocate<MathObject>(*this, *this), attr);
     define_direct_property(vm.names.JSON, heap().allocate<JSONObject>(*this, *this), attr);
     define_direct_property(vm.names.Reflect, heap().allocate<ReflectObject>(*this, *this), attr);
+    define_direct_property(vm.names.Temporal, heap().allocate<Temporal::Temporal>(*this, *this), attr);
 
     // This must be initialized before allocating AggregateErrorConstructor, which uses ErrorConstructor as its prototype.
     initialize_constructor(vm.names.Error, m_error_constructor, m_error_prototype);

Userland/Libraries/LibJS/Runtime/Temporal/Temporal.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/Temporal.h>
+
+namespace JS::Temporal {
+
+// 1 The Temporal Object, https://tc39.es/proposal-temporal/#sec-temporal-objects
+Temporal::Temporal(GlobalObject& global_object)
+    : Object(*global_object.object_prototype())
+{
+}
+
+void Temporal::initialize(GlobalObject& global_object)
+{
+    Object::initialize(global_object);
+}
+
+}

Userland/Libraries/LibJS/Runtime/Temporal/Temporal.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Object.h>
+
+namespace JS::Temporal {
+
+class Temporal final : public Object {
+    JS_OBJECT(Temporal, Object);
+
+public:
+    explicit Temporal(GlobalObject&);
+    virtual void initialize(GlobalObject&) override;
+    virtual ~Temporal() override = default;
+};
+
+}