Metadata with Pydantic

[LuisFSegalla]

Based on issue #42, I've made a simple Pydantic model to replace the dictionary metadata structure that is currently being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.65%. Comparing base (8f747b3) to head (277208c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   85.61%   86.65%   +1.03%     
==========================================
  Files          11       11              
  Lines         424      442      +18     
==========================================
+ Hits          363      383      +20     
+ Misses         61       59       -2     

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[GDYendell]

Thanks @LuisFSegalla! This is a good start. I have some suggestions.

[GDYendell]

This is looking great. I think we are pretty much there now.

[GDYendell]

Thanks @LuisFSegalla !