feat: Make binning explicitly configurable in TGeo example

[niermann999]

This PR makes the surface binning in the TGeo Detector example explicitly configurable. In the json configuration a vector of bins for loc0 and loc1 is added for the negative, central and positive detector regions respectively. The binning must be set per layer, meaning that the number of layers must be known when configuring the detector building. Alternatively, a single binning entry of 0 can be used to trigger autobinning.
Also adds itk module splitter options to python bindings and enables tgeo json config dump from existing json config.

[niermann999]

Some more testing is needed, but the trackstate plot looks better:

[niermann999]

[paulgessinger]

Btw, I think root can actually evaluate sqrt(g_x_hit^2 + g_y_hit^2).

[niermann999]

Btw, I think root can actually evaluate sqrt(g_x_hit^2 + g_y_hit^2).
Good point!

[codecov]

Codecov Report

Merging #1126 (84699c9) into main (25a0f0b) will not change coverage.
The diff coverage is n/a.

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  Hits         8502     8502           
  Misses       3367     3367           
  Partials     5775     5775           

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[timadye]

Thanks for this update. I tested it with your ITk JSON in acts-detector-examples!11 and it works perfectly for me too - just as you show above.

With the Python bindings, we should also update the Examples/Scripts/Python/itk.py example. That does a TGeoDetector.create() with the whole ITk configuration specified in Python, rather than JSON. I think it makes sense to include it with this PR, so fix and test are consistent. At the moment itk.py produces lots of warning messages like:

11:06:01    InnerPixelsL   WARNING   Incorrect binning configuration found for loc1 protolayer #0. Either no configuration or too few configurations were provided. Using auto-binning for this layer instead.

I guess the change needed is to add binning0 and binning1 settings to the TGeoDetector.create() call in itk.py? Does it also need other changes, eg. for the module splitting?

[niermann999]

That's a good point. Yes, I think it needs both configurations added. The binning option is at least already registered in this PR, I will add the configuration