[REVIEW] Adding haversine to brute force knn

[cjnolet]

No description provided.

[divyegala]

Half a day to put this out, and I literally have no comments to add! Looks excellent, thanks Corey

[JohnZed]

@gpucibot merge

[codecov-io]

Codecov Report

Merging #3579 (e29fa13) into branch-0.19 (9fa6e17) will increase coverage by 45.58%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           branch-0.19    #3579       +/-   ##
================================================
+ Coverage        35.24%   80.83%   +45.58%     
================================================
  Files              378      227      -151     
  Lines            26910    17737     -9173     
================================================
+ Hits              9485    14337     +4852     
+ Misses           17425     3400    -14025     

Flag	Coverage Δ
dask	45.30% <0.00%> (+0.30%)	⬆️
non-dask	73.09% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/cuml/neighbors/__init__.py	100.00% <ø> (ø)
python/cuml/neighbors/nearest_neighbors.pyx	92.64% <100.00%> (+50.89%)	⬆️
python/cuml/dask/solvers/cd.py	100.00% <0.00%> (ø)
python/cuml/common/numba_utils.py	0.00% <0.00%> (ø)
python/cuml/internals/global_settings.py	100.00% <0.00%> (ø)
python/cuml/dask/preprocessing/encoders.py	100.00% <0.00%> (ø)
cuml/comm/serialize.py
cuml/preprocessing/__init__.py
cuml/_thirdparty/sklearn/utils/validation.py
cuml/preprocessing/label.py
... and 286 more

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