feat: add slice.Intersection

[Primetalk]

ref #116

[codecov]

Codecov Report

Base: 84.92% // Head: 84.94% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (606b35e) compared to base (5f4c9bf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   84.92%   84.94%   +0.02%     
==========================================
  Files          44       44              
  Lines        1957     1960       +3     
==========================================
+ Hits         1662     1665       +3     
  Misses        256      256              
  Partials       39       39              

Impacted Files	Coverage Δ
slice/slice.go	94.04% <100.00%> (+0.10%)	⬆️

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