Implement np_shuffle

[MarcT0K]

Implements the shuffle coroutine for numpy-like arrays.

This is a copy of #49 because I moved the commits to a secondary branch to clean up my master branch. In parallel, I am closing #49.

This cleaning was necessary to prepare my repo for other PRs.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.08% 🎉

Comparison is base (aa71585) 92.54% compared to head (f5d673d) 93.63%.
Report is 7 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   92.54%   93.63%   +1.08%     
==========================================
  Files          16       16              
  Lines        8451     9879    +1428     
==========================================
+ Hits         7821     9250    +1429     
+ Misses        630      629       -1     

Files Changed	Coverage Δ
mpyc/random.py	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[Am0stafa]

LGTM