Rename ExoneraTor packages
This ticket is based on a discussion on #24036 (moved):
- Rename root package
org.torproject.exonerator
toorg.torproject.metrics.exonerator
to make it part of the Tor Metrics name space. - Reconsider moving some classes to metrics-lib for re-use from metrics-web, but not before the Jetty switch and possibly related changes are over.