Update Haversine Primitive

[gsheni]

• The formula we use for the haversine calculation, is based on the formula found here:
  https://andrew.hedges.name/experiments/haversine/
• However, the earth radius value we use is slightly inaccurate, so I wanted to find a more precise value, and reached this:
  https://en.wikipedia.org/wiki/Earth_radius#Mean_radius

For Earth, the mean radius is 6,371.0088 km (3,958.7613 mi).

[codecov]

Codecov Report

Merging #462 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #462   +/-   ##
=======================================
  Coverage   96.49%   96.49%           
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  Files         102      102           
  Lines        8693     8693           
=======================================
  Hits         8388     8388           
  Misses        305      305

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

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