Designer uses internal PropertyTypeId

[adangel]

With https://github.com/pmd/pmd/pull/4809 the class PropertyTypeId has been internalized in pmd-core and should not be used by downstream projects.

From the class doc of PropertyTypeId:

This class' API is mainly provided to build GUIs for XPath rules like the rule designer, so that they have info about the available properties from XML. As such, the number of clients are probably low. Fow now, this stays as Internal API and might be changed.

PropertyTypeId is used by pmd-designer and by pmd-eclipse-plugin.

Maybe we can provide a public API for this. Or maybe this can be avoided by leveraging the serialization mechanism (PropertyDescriptor#serializer()) directly.