Implement Unit support in compiler

[kettlebell]

Close #820

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.75%. Comparing base (d254cad) to head (362ec30).
Report is 8 commits behind head on v5.0-finalize.

Additional details and impacted files

@@                Coverage Diff                @@
##           v5.0-finalize     #822      +/-   ##
=================================================
+ Coverage          71.74%   71.75%   +0.01%     
=================================================
  Files                248      248              
  Lines              18847    18852       +5     
  Branches             555      642      +87     
=================================================
+ Hits               13521    13527       +6     
+ Misses              5326     5325       -1     

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