Add ML aerosol activation emulators

[mikhailmints]

Purpose

This PR adds support for ML aerosol activation emulators to be used instead of the ARG scheme.

To-do

Fix the tests and documentation for these changes, possibly improve the abstractions used in the models to avoid hardcoding hyperparameters.

Content

• Add support for using data-driven emulators of aerosol activation, which can be loaded through MLJ.
• Add utilities for data preprocessing and model construction.
• Add the free parameters of the ARG scheme to the parameter set.
• Add PySDM data to ARG plots in documentation.

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• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

Attention: 170 lines in your changes are missing coverage. Please review.

Comparison is base (0898dd4) 98.19% compared to head (e7cc4e2) 82.46%.
Report is 122 commits behind head on main.

❗ Current head e7cc4e2 differs from pull request most recent head e73b042. Consider uploading reports for the commit e73b042 to get more accurate results

Files	Patch %	Lines
src/PreprocessAerosolData.jl	0.00%	123 Missing ⚠️
src/ActivationEmulatorModels.jl	0.00%	35 Missing ⚠️
src/AerosolActivation.jl	47.82%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #172       +/-   ##
===========================================
- Coverage   98.19%   82.46%   -15.73%     
===========================================
  Files          13       15        +2     
  Lines         887     1061      +174     
===========================================
+ Hits          871      875        +4     
- Misses         16      186      +170     

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[trontrytel]

Done in #349 and #318