Add GCS_North_American_1983 string code

[lupemba]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.90%. Comparing base (c88360c) to head (6495b3b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #168   +/-   ##
=======================================
  Coverage   96.90%   96.90%           
=======================================
  Files          26       26           
  Lines        1130     1130           
=======================================
  Hits         1095     1095           
  Misses         35       35           

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[juliohm]

Thank you @lupemba !