Add new optical propagation interface that will allow optical transport on GPU

[stognini]

This PR adds a new OpticalPropagation_module, which will replace the current PDFastSimPAR_module. The new module will take advantage of a new IOpticalPropagation abstract interface class, which will allow the implementation of (currently) 3 separate art::tools:

• PDFastSimPAR: This will mirror the existing module.
• Celeritas: This will allows the propagation of optical photons on CPU and GPU through Celeritas
• Opticks: This will allow the propagation of optical photons on Nvidia GPUs through the Opticks package.

[stognini]

Marked PR as draft since I have a small list of todo's still, but will expedite discussion:

Todo's

• Agree on nomenclature for new interface, tools, and module
• Add fcl files for the module job execution and tools
• Confirm/update code standards (from variable naming to class/function documentation)
• Fix current build issue

In file included from /home/stognini/larsoft/srcs/larsim/larsim/PhotonPropagation/OpticalPropagationTools/OpticalPropPDFastSimPAR.h:8,
                 from /home/stognini/larsoft/srcs/larsim/larsim/PhotonPropagation/OpticalPropagationTools/OpticalPropPDFastSimPAR_tool.cc:6:
/home/stognini/larsoft/srcs/larsim/larsim/PhotonPropagation/OpticalPropagationTools/IOpticalPropagation.h:11:10: fatal error: lardataobj/Simulation/OpDetBacktrackerRecord.h: No such file or directory
   11 | #include "lardataobj/Simulation/OpDetBacktrackerRecord.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~