Homogeneous freezing

[tluettm]

Added homogeneous freezing routines as an optional freezing mode in the freezing dynamic

[tluettm]

I can't figure out what pdoc wants changed. As for pylint complaints - I don't see what other examples do differently. They also don't call super().init

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 9 lines in your changes missing coverage. Please review.

Project coverage is 85.52%. Comparing base (f4931b6) to head (4593b99).

Files with missing lines	Patch %	Lines
...ics/homogeneous_ice_nucleation_rate/koop_murray.py	57.14%	3 Missing ⚠️
...DM/physics/homogeneous_ice_nucleation_rate/koop.py	66.66%	2 Missing ⚠️
...hysics/homogeneous_ice_nucleation_rate/constant.py	85.71%	1 Missing ⚠️
...ysics/homogeneous_ice_nucleation_rate/koop_corr.py	83.33%	1 Missing ⚠️
...DM/physics/homogeneous_ice_nucleation_rate/null.py	83.33%	1 Missing ⚠️
PySDM/physics/trivia.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1488      +/-   ##
==========================================
+ Coverage   85.49%   85.52%   +0.03%     
==========================================
  Files         393      399       +6     
  Lines        9571     9654      +83     
==========================================
+ Hits         8183     8257      +74     
- Misses       1388     1397       +9     

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