Collisional ionization

[chvogl]

This PR will add collisional ionization to the macro atom scheme.

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (please describe)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1509 (3b1f78a) into master (f545ede) will decrease coverage by 0.18%.
The diff coverage is n/a.

❗ Current head 3b1f78a differs from pull request most recent head bef53b6. Consider uploading reports for the commit bef53b6 to get more accurate results

@@            Coverage Diff             @@
##           master    #1509      +/-   ##
==========================================
- Coverage   68.12%   67.94%   -0.19%     
==========================================
  Files          68       68              
  Lines        6040     6070      +30     
==========================================
+ Hits         4115     4124       +9     
- Misses       1925     1946      +21     

Impacted Files	Coverage Δ
...is/tardis/plasma/properties/continuum_processes.py	38.48% <0.00%> (-0.73%)	⬇️
...s/tardis/plasma/properties/property_collections.py	100.00% <0.00%> (ø)
...rdis/plasma/properties/transition_probabilities.py	32.46% <0.00%> (ø)

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