ARQGRA-199: Provide a way to create Page Fragments dynamically

To enable this ``PageFragmentEnricher#createPageFragment`` and related
methods were made static. Test which creates PageFragment from TabPanel
dynamically added.

Question: Do you have any concern about making  ``PageFragmentEnricher#createPageFragment`` as ``public static`` ? Me not. But another approach can be to create something like Factory class ...