Modularized stdlib_stats

[jvdp1]

Here is an attempt to modularize further stdlib with making stdlib_stats optional

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 68.93%. Comparing base (72ad5fb) to head (77f39bb). :warning: Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1066   +/-   ##
=======================================
  Coverage   68.93%   68.93%           
=======================================
  Files         390      390           
  Lines       12650    12650           
  Branches     1377     1377           
=======================================
  Hits         8720     8720           
  Misses       3930     3930           

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