Haversine Unit argument

[gsheni]

• Added a unit argument to the Haversine primitive to specify miles or kilometers
• Added a test case which checks this calculation.

[codecov]

Codecov Report

Merging #435 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
+ Coverage   96.32%   96.33%   +0.01%     
==========================================
  Files          95       95              
  Lines        8514     8539      +25     
==========================================
+ Hits         8201     8226      +25     
  Misses        313      313

Impacted Files	Coverage Δ
...retools/primitives/standard/transform_primitive.py	100% <100%> (ø)	⬆️
...s/tests/primitive_tests/test_transform_features.py	98.53% <100%> (+0.02%)	⬆️

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