NLTE excitation solver

[sonachitchyan]

📝 Description

Type: 🪲 bugfix | 🚀 feature | ☣️ breaking change | 🚦 testing | 📝 documentation | 🎢 infrastructure

This PR implements NLTE excitation solver

Also, link issues affected by this pull request by using the keywords: close, closes, closed, fix, fixes, fixed, resolve, resolves or resolved.

📌 Resources

Examples, notebooks, and links to useful references.

🚦 Testing

How did you test these changes?

• Testing pipeline
• Other method (describe)
• My changes can't be tested (explain why)

☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[codecov]

Codecov Report

Merging #2405 (403e4b2) into master (a3bb122) will decrease coverage by 0.19%.
The diff coverage is 0.00%.

❗ Current head 403e4b2 differs from pull request most recent head 8cc0444. Consider uploading reports for the commit 8cc0444 to get more accurate results

@@            Coverage Diff             @@
##           master    #2405      +/-   ##
==========================================
- Coverage   68.49%   68.31%   -0.19%     
==========================================
  Files         145      146       +1     
  Lines       13247    13282      +35     
==========================================
  Hits         9073     9073              
- Misses       4174     4209      +35     

Files Changed	Coverage Δ
tardis/plasma/properties/nlte_excitation_matrix.py	0.00% <0.00%> (ø)

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