LibJS: Move intrinsics to the realm

Intrinsics, i.e. mostly constructor and prototype objects, but also
things like empty and new object shape now live on a new heap-allocated
JS::Intrinsics object, thus completing the long journey of taking all
the magic away from the global object.
This represents the Realm's [[Intrinsics]] slot in the spec and matches
its existing [[GlobalObject]] / [[GlobalEnv]] slots in terms of
architecture.

In the majority of cases it should now be possibly to fully allocate a
regular object without the global object existing, and in fact that's
what we do now - the realm is allocated before the global object, and
the intrinsics between both :^)

Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.cpp

@@ -257,7 +257,7 @@ ThrowCompletionOr<Array*> format_relative_time_to_parts(VM& vm, RelativeTimeForm
     // 4. For each Record { [[Type]], [[Value]], [[Unit]] } part in parts, do
     for (auto& part : parts) {
         // a. Let O be OrdinaryObjectCreate(%Object.prototype%).
-        auto* object = Object::create(realm, realm.global_object().object_prototype());
+        auto* object = Object::create(realm, realm.intrinsics().object_prototype());
 
         // b. Perform ! CreateDataPropertyOrThrow(O, "type", part.[[Type]]).
         MUST(object->create_data_property_or_throw(vm.names.type, js_string(vm, part.type)));