Adding initial support for custom scalars

[rmyers]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.36%. Comparing base (cefb2a6) to head (13ee19c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   90.28%   90.36%   +0.08%     
==========================================
  Files          17       17              
  Lines         834      841       +7     
==========================================
+ Hits          753      760       +7     
  Misses         81       81              

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