add keysort/2

[ichiban]

#144

[codecov-commenter]

Codecov Report

Merging #154 (414164a) into main (9c4a726) will increase coverage by 0.06%.
The diff coverage is 93.93%.

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   93.84%   93.90%   +0.06%     
==========================================
  Files          18       18              
  Lines        5262     5281      +19     
==========================================
+ Hits         4938     4959      +21     
+ Misses        274      272       -2     
  Partials       50       50              

Impacted Files	Coverage Δ
engine/atom.go	100.00% <ø> (ø)
engine/float.go	93.75% <ø> (-0.70%)	⬇️
engine/integer.go	100.00% <ø> (ø)
engine/term.go	100.00% <ø> (+4.54%)	⬆️
engine/variable.go	94.11% <ø> (-0.62%)	⬇️
engine/builtin.go	91.23% <91.15%> (+0.02%)	⬆️
engine/compound.go	100.00% <100.00%> (ø)
engine/exception.go	98.11% <100.00%> (+0.86%)	⬆️
engine/stream.go	100.00% <100.00%> (ø)
engine/vm.go	80.96% <100.00%> (+0.18%)	⬆️
... and 4 more

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