Add leakage models to core

[codecov[bot]]

Codecov Report

Merging #37 (0a5c97d) into master (1b115ca) will decrease coverage by 0.02%. The diff coverage is 88.78%.

:exclamation: Current head 0a5c97d differs from pull request most recent head 165ad07. Consider uploading reports for the commit 165ad07 to get more accurate results

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   89.88%   89.86%   -0.02%     
==========================================
  Files          56       58       +2     
  Lines        4080     4169      +89     
  Branches      720      738      +18     
==========================================
+ Hits         3667     3746      +79     
- Misses        268      275       +7     
- Partials      145      148       +3     

Impacted Files	Coverage Δ
pyecsca/ec/formula.py	94.38% <80.00%> (-0.52%)	:arrow_down:
pyecsca/ec/context.py	88.55% <83.34%> (-0.33%)	:arrow_down:
pyecsca/sca/attack/leakage_model.py	89.40% <89.40%> (ø)
pyecsca/ec/op.py	96.91% <100.00%> (+0.28%)	:arrow_up:
pyecsca/sca/__init__.py	100.00% <100.00%> (ø)
pyecsca/sca/attack/__init__.py	100.00% <100.00%> (ø)

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