switch to non reflect/generics slices.Sort() for 56% speed improvement

[ldemailly]

switch to non reflect/generics slices.Sort() for 56% speed improvement in sets.Sort

// sort.Slices (reflect) - before
BenchmarkSetSort1000-10        16862         70937 ns/op        8248 B/op          3 allocs/op
// slices.Sort - after
BenchmarkSetSort1000-10        26198         45288 ns/op        8192 B/op          1 allocs/op

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b133bfa) 100.00% compared to head (a6bdbaa) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          122       122           
=========================================
  Hits           122       122           

Impacted Files	Coverage Δ
sets.go	100.00% <100.00%> (ø)

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