Fix cmg bug where type aliases are replaced by their underlying types

[douglaswth]

• The initial effort to support type aliases was pulling the underlying type of type aliases when generating type names and zero values, but that was not the correct behavior. This fix changes it so type aliases are treated the same way as named types.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.45%. Comparing base (7757c8b) to head (96aff9e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
+ Coverage   85.34%   85.45%   +0.10%     
==========================================
  Files          39       39              
  Lines        2211     2227      +16     
==========================================
+ Hits         1887     1903      +16     
  Misses        298      298              
  Partials       26       26              

Flag	Coverage Δ
micro	85.45% <100.00%> (+0.10%)	⬆️

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[raphael]

Looks great, thank you!