Simplify and add to system config diagnostics

[sethrj]

This adds a few more outputs (most importantly, the type of openmp configuration) and refactors the config diagnostic output for improved simplicity. ("Use" is now a set of all enabled options. The new config looks like:

{
  "config": {
    "build_type": "debug,shared",
    "core_geo": "ORANGE",
    "core_rng": "xorwow",
    "debug": true,
    "gpu_architectures": "",
    "hostname": "...",
    "openmp": "disabled",
    "real_type": "double",
    "units": "CGS",
    "use": [
      "geant4",
      "hepmc3",
      "root"
    ],
    "versions": {
      "CLHEP": "2.4.7.1",
      "Geant4": "11.0.4",
      "HepMC3": "3.03.00",
      "ROOT": "6.32.06"
    }
  }
}

compared to:

  "config": {
    "CELERITAS_BUILD_TYPE": "debug,shared",
    "CELERITAS_CORE_GEO": "ORANGE",
    "CELERITAS_CORE_RNG": "xorwow",
    "CELERITAS_DEBUG": true,
    "CELERITAS_HOSTNAME": "Goldfinger-4",
    "CELERITAS_REAL_TYPE": "double",
    "CELERITAS_UNITS": "CGS",
    "CELERITAS_USE_CUDA": false,
    "CELERITAS_USE_GEANT4": true,
    "CELERITAS_USE_HEPMC3": true,
    "CELERITAS_USE_HIP": false,
    "CELERITAS_USE_MPI": false,
    "CELERITAS_USE_OPENMP": false,
    "CELERITAS_USE_ROOT": true,
    "CELERITAS_USE_VECGEOM": false,
    "CLHEP_VERSION": "2.4.7.1",
    "Geant4_VERSION": "11.0.4"
  }

Note that for backward compatibility, this leaves the old config to peacefully coexist with the new (to be removed at the 0.6 release).

[github-actions]

Test summary

 4 478 files   6 904 suites   15m 33s ⏱️
 1 693 tests  1 687 ✅  6 💤 0 ❌
24 231 runs  24 147 ✅ 84 💤 0 ❌

Results for commit 929f52e.

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