Register a custom class in context using the given name. If the new class inherits from
another #JSCClass, the parent should be passed as parent_class, otherwise null should be
used. The optional vtable parameter allows to provide a custom implementation for handling
the class, for example, to handle external properties not added to the prototype.
When an instance of the #JSCClass is cleared in the context, destroy_notify is called with
the instance as parameter.
Register a custom class in context using the given name. If the new class inherits from another #JSCClass, the parent should be passed as parent_class, otherwise null should be used. The optional vtable parameter allows to provide a custom implementation for handling the class, for example, to handle external properties not added to the prototype. When an instance of the #JSCClass is cleared in the context, destroy_notify is called with the instance as parameter.