Add mgc and mgc RF

[sampan501]

Reference issue

Closes #18
Closes #19

Type of change

Feature

What does this implement/fix?

Adds MGC and MGCRF

Additional information

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0a9a0c5). Click here to learn what that means.
The diff coverage is 80.76%.

@@           Coverage Diff            @@
##             master     #50   +/-   ##
========================================
  Coverage          ?   86.8%           
========================================
  Files             ?      28           
  Lines             ?    1046           
  Branches          ?       0           
========================================
  Hits              ?     908           
  Misses            ?     138           
  Partials          ?       0

Impacted Files	Coverage Δ
mgc/discrim/discrim_two_samp.py	74.5% <ø> (ø)
mgc/discrim/discrim_one_samp.py	100% <ø> (ø)
mgc/ksample/_utils.py	94.73% <100%> (ø)
mgc/independence/mgc.py	100% <100%> (ø)
mgc/ksample/base.py	100% <100%> (ø)
mgc/ksample/ksamp.py	94.73% <100%> (ø)
mgc/random_forest/mgc_rf.py	47.36% <47.36%> (ø)

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