Add use_ratings option to ImplicitMF

[mdekstrand]

This adds a use_ratings option to ImplicitMF, currently defaulting to True (previous behavior), but scheduled to start defaulting to False.

[codecov]

Codecov Report

Merging #245 (c570422) into main (f9a6937) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
+ Coverage   91.89%   92.13%   +0.24%     
==========================================
  Files          44       44              
  Lines        3565     3624      +59     
==========================================
+ Hits         3276     3339      +63     
+ Misses        289      285       -4     

Impacted Files	Coverage Δ
lenskit/algorithms/als.py	98.05% <100.00%> (+0.06%)	⬆️
lenskit/util/__init__.py	84.48% <100.00%> (+0.84%)	⬆️
lenskit/crossfold.py	98.42% <0.00%> (-0.77%)	⬇️
lenskit/util/test.py	91.89% <0.00%> (+4.39%)	⬆️
lenskit/metrics/topn.py	100.00% <0.00%> (+4.46%)	⬆️

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[codeclimate]

Code Climate has analyzed commit c570422 and detected 0 issues on this pull request.

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