[GR-60234] Register superclass serialization constructors by default

[graalvmbot]

All serializable types can now be serialized with all possible constructors, removing the need for the "customTargetConstructorClass" field in reachability-metadata.json. This was evaluated to have only a minimal impact on the resulting image size (see #9679). As an example, the following JSON registration:

{
  "serialization": [
    {
      "type": "fully.qualified.ClassName"
    }
  ]
}

wille become equivalent to:

{
  "serialization": [
    {
      "type": "fully.qualified.ClassName",
      "customTargetConstructorClass": "super.constructor.ClassName"
    }
  ]
}

Calling RuntimeSerialization.register(clazz) will also register all possible serialization constructors, and RuntimeSerialization.registerWithTargetConstructorClass(clazz, constructor) will become functionally equivalent to RuntimeSerialization.register(clazz).