Dump persistence generated classes to disk with Quarkus

With Spring Boot, we dump generated compiled persistence classes to target/classes, so they are easily viewable by a user in case they want to debug.

With Quarkus, however, it is a bit different as the generated persistence classes are compiled in memory and then registered with Quarkus, but not dumped to the disk. The reason is we filter generated persistence classes for resources (like proto files) and dump only those. It would be good to have all generated files written on the disk.