SOM

[nstarman]

Description

Add SOM basics. tests come later.

PR Checklist

• Check out the contributing guidelines and code of conduct
• Check out the contributing workflow ( for a practical example click here )
• Give a detailed description of the PR here.
• Document changes in the CHANGES.rst file.
• Make sure the docs are up to date.
• Add yourself to credits.rst file.
• Ensure linear history by rebasing.

[codecov]

Codecov Report

Merging #20 (b1d33e0) into master (8f2a32a) will decrease coverage by 10.08%.
The diff coverage is 19.36%.

@@             Coverage Diff             @@
##           master      #20       +/-   ##
===========================================
- Coverage   80.37%   70.29%   -10.09%     
===========================================
  Files          20       22        +2     
  Lines        1121     1343      +222     
===========================================
+ Hits          901      944       +43     
- Misses        220      399      +179     

Impacted Files	Coverage Δ
trackstream/conf.py	0.00% <0.00%> (ø)
trackstream/preprocess/som.py	19.40% <19.40%> (ø)
trackstream/preprocess/utils.py	70.27% <26.66%> (-29.73%)	⬇️

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