feat: add offset support to binary logistic regression, #431

[espenblyn]

#431

Adds an optional offset parameter (standard None) to logistic regression, not learned.

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.82%. Comparing base (12c6c73) to head (c971f0e).

Files with missing lines	Patch %	Lines
algorithms/linfa-logistic/src/hyperparams.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
+ Coverage   76.73%   76.82%   +0.08%     
==========================================
  Files         106      106              
  Lines        7410     7434      +24     
==========================================
+ Hits         5686     5711      +25     
+ Misses       1724     1723       -1     

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