feat: add json IO for GridAccess delegates

[asalzburger]

This PR adds the json IO for the grid access delegates, so that they can be used for writing material files and navigation IO formats.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.82%. Comparing base (e9ea680) to head (38b09fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3047   +/-   ##
=======================================
  Coverage   48.82%   48.82%           
=======================================
  Files         491      491           
  Lines       28909    28909           
  Branches    13724    13724           
=======================================
  Hits        14114    14114           
  Misses       4956     4956           
  Partials     9839     9839           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[AJPfleger]

I am not a big fan of 1-3 letter acronym variables (ga, jga, la, jla, j, t). Could it make sense to find more descriptive names?

[github-actions]

📊: Physics performance monitoring for 30b4a6f

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

[AJPfleger]

lgtm!

[acts-project-service]

✅ Athena integration test results [0982f68]

✅ All tests successful

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