add subsumes_term/2

[ichiban]

#144

[codecov-commenter]

Codecov Report

Merging #149 (e568962) into main (c552b76) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
+ Coverage   93.77%   93.78%   +0.01%     
==========================================
  Files          18       18              
  Lines        5207     5217      +10     
==========================================
+ Hits         4883     4893      +10     
  Misses        274      274              
  Partials       50       50              

Impacted Files	Coverage Δ
engine/builtin.go	90.97% <100.00%> (+0.03%)	⬆️
interpreter.go	92.18% <100.00%> (+0.04%)	⬆️

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