float sample_weight for precision/recall metrics

[alexander-g]

Precision and Recall metrics now accept floating point sample_weight parameters

[codecov-io]

Codecov Report

Merging #122 (045f1a7) into master (65e807c) will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   77.41%   77.43%   +0.01%     
==========================================
  Files         106      106              
  Lines        4836     4840       +4     
==========================================
+ Hits         3744     3748       +4     
  Misses       1092     1092              

Impacted Files	Coverage Δ
elegy/metrics/reduce_confusion_matrix.py	85.45% <75.00%> (ø)
elegy/metrics/precision_test.py	100.00% <100.00%> (ø)
elegy/metrics/recall_test.py	100.00% <100.00%> (ø)

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[cgarciae]

Thanks @alexander-g !
LGTM