make compatible with juggler

Changelog

• capable of building with https://eicweb.phy.anl.gov/EIC/detectors/athena (probably won't need this soon)
• apply diff of erich/src/ERich_geo.cpp to athena repo in EIC/detectors/athena!269 (closed) (deprecated)
• export cmake package config files for juggler build
• see also associated juggler and benchmarks MRs:
  • juggler!326 (closed)
  • EIC/benchmarks/reconstruction_benchmarks!222

Issues addressed

• close #2 (closed)
• close #3 (closed)