add the capability to operate with photon cross sections in the plotter.py module

[marco-de-pietri]

Description

This PR add the capability to operate with photon cross sections in the plotter.py module. It corresponds to a PR split as suggested by @GuySten of the PR #3700 to ease the review process.

This feature is intended to support the computation of gamma contact dose rate but can be useful for processing photon-related material quantities in the python api (linear attenuation factor for example) and for the plotter itself.

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[GuySten]

I've added a few fixes:

1. missing one ENDF sum rule.
2. When running the tests we are guaranteed to have photoatomic cross sections so there was no reason for pytest.skip

[GuySten]

Looks good to me.
Currently this PR is marked as draft.
Is it still the case?
(We cannot merge draft PRs)

[paulromano]

I'd like to take a look at this before merging