[perf] Remove commons digester

I currently working on a prototype as quarkus module and MF startup itself takes ~4 seconds.
The reason is that parsing the faces-config with digester seems sometimes (very) slow.
I now replaced it with an DOM parser with similar pattern as digester and the starutp is now ~500ms.
It also removes a dependency and the new parser is even the same size (LOC) as the old...