feat: slice.Exists, slice.Forall

[Primetalk]

fix #87

[codecov]

Codecov Report

Base: 83.76% // Head: 83.91% // Increases project coverage by +0.14% 🎉

Coverage data is based on head (cbbf228) compared to base (84ed096).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   83.76%   83.91%   +0.14%     
==========================================
  Files          37       37              
  Lines        1718     1734      +16     
==========================================
+ Hits         1439     1455      +16     
  Misses        242      242              
  Partials       37       37              

Impacted Files	Coverage Δ
slice/slice.go	89.16% <100.00%> (+1.66%)	⬆️

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