feat: Python bindings for Geant4 manager and handle

[andiwand]

This enables us to inspect the current handle of Geant4 and therefore adjust the log level from python which is useful while debugging.

[codecov]

Codecov Report

Merging #2500 (e8a62c9) into main (a3013a0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2500   +/-   ##
=======================================
  Coverage   49.79%   49.79%           
=======================================
  Files         466      466           
  Lines       26262    26262           
  Branches    12063    12063           
=======================================
  Hits        13076    13076           
  Misses       4613     4613           
  Partials     8573     8573           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[felix-russo]

Looks good, just one question for my personal understanding

[github-actions]

📊: Physics performance monitoring for e8a62c9

Full contents

physmon summary

• ✅ CKF truth_smeared
• ✅ IVF truth_smeared
• ✅ AMVF truth_smeared
• ✅ Track Summary CKF truth_smeared
• ✅ Seeding truth_estimated
• ✅ CKF truth_estimated
• ✅ IVF truth_estimated
• ✅ AMVF truth_estimated
• ✅ Track Summary CKF truth_estimated
• ✅ Seeding seeded
• ✅ CKF seeded
• ✅ IVF seeded
• ✅ AMVF seeded
• ✅ AMVF (+grid seeder) seeded
• ✅ Track Summary CKF seeded
• ✅ Seeding orthogonal
• ✅ CKF orthogonal
• ✅ IVF orthogonal
• ✅ AMVF orthogonal
• ✅ Track Summary CKF orthogonal
• ✅ Ambisolver seeded
• ✅ Ambisolver orthogonal
• ✅ Seeding ttbar
• ✅ CKF ttbar
• ✅ Ambisolver
• ✅ AMVF ttbar
• ✅ AMVF (+grid seeder) ttbar
• ✅ Truth tracking (GSF)
• ✅ Truth tracking
• ✅ Particles inital fatras
• ✅ Particles final fatras
• ✅ Particles inital geant4
• ✅ Particles final geant4

Invalidated by push of 90a18d9