feat: Add basic regions support to G4 example

[ntadej]

I work with fast simulation for silicon detectors and I was interested to see how G4ProductionCuts affect the number of secondary particles. This may be useful also for other people so adding it here.

Note that I still need to adapt all detector factories (only DD4HEP one is done for now), but I want to get feedback first if you think this is useful to have.

/cc @andiwand @paulgessinger

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 48.98%. Comparing base (3203649) to head (6dfbe9e). Report is 38 commits behind head on main.

:exclamation: Current head 6dfbe9e differs from pull request most recent head ef1eb8c. Consider uploading reports for the commit ef1eb8c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3061      +/-   ##
==========================================
- Coverage   49.09%   48.98%   -0.11%     
==========================================
  Files         497      489       -8     
  Lines       29155    28947     -208     
  Branches    13851    13713     -138     
==========================================
- Hits        14314    14181     -133     
- Misses       4908     4951      +43     
+ Partials     9933     9815     -118     

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[github-actions[bot]]

📊: Physics performance monitoring for ef1eb8ce1284f79d526f4547e22d264ca99a41ca

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
• ✅ Track Summary CKF ttbar
• ✅ AMVF ttbar
• ✅ AMVF (+grid seeder) ttbar
• ✅ Truth tracking (GSF)
• ✅ Truth tracking
• ✅ Truth tracking (GX2F)
• ✅ Particles fatras
• ✅ Particles geant4

[acts-project-service]

:white_check_mark: Athena integration test results [d1511d004145a448c4e0de8d01f5ad03efcd6828]

:white_check_mark: All tests successful

status	job	report
:green_circle:	run_unit_tests
:green_circle:	test_ActsEFTrackFit
:green_circle:	test_ActsPersistifySeeds
:green_circle:	test_ActsBenchmarkWithSpot
:green_circle:	test_ActsAnalogueClustering
:green_circle:	test_ActsConversionWorkflow
:green_circle:	test_ActsWorkflowFastTracking
:green_circle:	test_ActsWorkflow
:green_circle:	test_ActsValidateAmbiguityResolution
:green_circle:	test_ActsValidateResolvedTracks
:green_circle:	test_ActsValidateTracks
:green_circle:	test_ActsValidateActsCoreSpacePoints
:green_circle:	test_ActsValidateActsSpacePoints
:green_circle:	test_ActsValidateSeeds
:green_circle:	test_ActsValidateOrthogonalSeeds
:green_circle:	test_ActsValidateClusters
:green_circle:	test_ActsPersistifyEDM
:green_circle:	test_ActsGSFRefitting
:green_circle:	test_ActsKfRefitting
:green_circle:	test_ActsExtrapolationAlgTest
:green_circle:	test_ActsITkTest
:green_circle:	run_workflow_tests_run4_mc
:green_circle:	run_workflow_tests_run2_mc
:green_circle:	run_workflow_tests_run2_data
:green_circle:	run_workflow_tests_run3_mc
:green_circle:	run_workflow_tests_run3_data
:green_circle:	run_art_test: test_data18_13TeV_1000evt
:green_circle:	run_art_test: test_ttbarPU40_reco