Adding Summary Stats feature

[nikml]

Commit 8cd46a23b should be reverted before merging as it updates python versions. Used it to help with dev setup.

[codecov]

Codecov Report

Patch coverage: 89.64% and project coverage change: +0.52 🎉

Comparison is base (cb338cc) 83.22% compared to head (2a5e4fe) 83.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
+ Coverage   83.22%   83.74%   +0.52%     
==========================================
  Files          82      100      +18     
  Lines        6431     7130     +699     
  Branches      974     1254     +280     
==========================================
+ Hits         5352     5971     +619     
- Misses        818      862      +44     
- Partials      261      297      +36     

Impacted Files	Coverage Δ
nannyml/io/raw_files_writer.py	75.00% <ø> (ø)
nannyml/thresholds.py	85.71% <ø> (ø)
nannyml/data_quality/unseen/__init__.py	80.00% <50.00%> (-20.00%)	⬇️
nannyml/base.py	83.11% <66.66%> (+0.77%)	⬆️
nannyml/stats/base.py	80.00% <80.00%> (ø)
nannyml/stats/avg/calculator.py	86.51% <86.51%> (ø)
nannyml/stats/sum/calculator.py	86.51% <86.51%> (ø)
nannyml/stats/median/calculator.py	86.66% <86.66%> (ø)
nannyml/stats/std/calculator.py	86.66% <86.66%> (ø)
nannyml/stats/avg/result.py	92.00% <92.00%> (ø)
... and 16 more

... and 11 files with indirect coverage changes

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