refactor: Rename units field to pous

[volsa]

Renames the CompilationUnit::units struct field to CompilationUnit::pous

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.09%. Comparing base (e731987) to head (a372946).
Report is 34 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1438      +/-   ##
==========================================
+ Coverage   93.67%   94.09%   +0.42%     
==========================================
  Files         166      171       +5     
  Lines       50097    54734    +4637     
==========================================
+ Hits        46928    51504    +4576     
- Misses       3169     3230      +61     

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