Integrate carsus atomic data repositories with carsus

[s-rathi]

Description 📝

This PR integrates the carsus-data-cmfgen, carsus-data-kurucz and carsus-data-nist to the carsus repository.

Type: 🎢 infrastructure

📌 Resources

Examples, notebooks, and links to useful references.

🚦 Testing

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• 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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[andrewfullard]

Does this mean we are completely replaced Chianti with CMFGen data for TARDIS? @wkerzendorf

[codecov]

Codecov Report

Merging #366 (ecd156c) into master (275c383) will decrease coverage by 6.31%.
Report is 55 commits behind head on master.
The diff coverage is 50.75%.

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   74.44%   68.13%   -6.31%     
==========================================
  Files          23       29       +6     
  Lines        2614     3534     +920     
==========================================
+ Hits         1946     2408     +462     
- Misses        668     1126     +458     

Files Changed	Coverage Δ
carsus/io/chianti_/chianti_.py	85.80% <0.00%> (+19.36%)	⬆️
carsus/io/nndc/base.py	0.00% <0.00%> (ø)
carsus/io/nndc/ensdf.py	0.00% <0.00%> (ø)
carsus/io/nndc/parsers.py	0.00% <0.00%> (ø)
carsus/io/output/base.py	8.96% <8.42%> (-1.88%)	⬇️
carsus/io/atom_data_compare.py	12.97% <12.97%> (ø)
carsus/io/zeta.py	27.65% <16.66%> (-2.35%)	⬇️
carsus/io/nist/ionization.py	95.36% <83.33%> (-1.18%)	⬇️
carsus/io/cmfgen/base.py	87.14% <85.49%> (+3.14%)	⬆️
carsus/io/nuclear/nndc.py	88.13% <88.13%> (ø)
... and 4 more

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