LibJS: Add Object::may_interfere_with_indexed_property_access() virtual

This function must return true if the object may intercept and customize
access to indexed properties (properties where the property name is a
non-negative integer.)

This will be used to implement fast path optimizations for array-like
accesses in subsequent commits.

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -2573,6 +2573,8 @@ private:
     virtual JS::ThrowCompletionOr<bool> internal_set_prototype_of(JS::Object* prototype) override;
     virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
 
+    virtual bool may_interfere_with_indexed_property_access() const final { return true; }
+
     JS::Realm& m_realm; // [[Realm]]
 };
 )~~~");