Research replacing QVariant

QVariant requires the use of the run-time registry based meta-type system. We should offer API in QMetaObject that allows avoiding this and instead uses for example std::any or a new custom Qt type. For example:

   // old
    QVariant data = object->property("name");
    object->setProperty("name", "test")
    // new
    std::any data = object->property("name");
    object->setProperty("name", "test");

We also need the ability to convert between a QVariant and the new variant type. The new type should not do any implicit conversions.