Remove resonance reconstruction and Cython dependency

[jon-proximafusion]

Description

This PR aims to remove the reconstruct.pyx file and associated usage.

If I remember the correctly then this file was made before njoy was opensource and openmc performed some nuclear data processes

Now njoy is open source this functionality is no longer needed.

If both this PR and PR #3101 are successful then this helps making the pypi pip packaging easier as we can remove the cython from the code.

Checklist

• I have performed a self-review of my own code
• I have followed the style guidelines for Python source files (if applicable)

[HunterBelanger]

Are any of the features in reconstruct.pyx in Paul's new ENDF package, or is the idea to simply remove this functionality completely ? Because if all the cython is removed from our Python API, that will definitely simply some of the workarounds I had to add to #2919 to make things work.

[shimwell]

ah sorry I should have added some more context here. I saw Paul at the open source workshop last week and asked what were the options for these files. They are not in Pauls endf package. However the files were added when njoy was not open source and now that njoy is open we don't need these files anymore. They don't get much usage in the code.

[paulromano]

To add some more context here — the Cython code in question that performs resonance reconstruction was added (#721) at a time when NJOY was not yet open sourced and there was a thought that perhaps we would do all our nuclear data processing "in house". However, shortly after this was merged, NJOY became open source and thus the resonance reconstruction in OpenMC sort of lost its raison d'être. It's also worth noting that what we have in OpenMC is also incomplete (doesn't handle LRF=7) and sometimes incorrect (see original description in #721). So, with that being said, I am not at all opposed to chopping this block of code and removing our dependence on Cython.

[shimwell]

super super, this will be really helpful, thanks for finishing the PR Paul

Congrats on your first PR @jon-proximafusion 😄 hope it will be the first of many

Will merge when tests pass

[paulromano]

Thanks for taking care of this @jon-proximafusion!