Remove pydantic support

[danielSanchezQ]

We are still on pydantic v1 (current stable version is v2). It is not worth it to actually support it directly.
This means a breaking change. We should bump up our versioning before publishing.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.51%. Comparing base (8a47e13) to head (4b3ac32).

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Additional details and impacted files

@@             Coverage Diff             @@
##              main      #22      +/-   ##
===========================================
- Coverage   100.00%   99.51%   -0.49%     
===========================================
  Files           14       10       -4     
  Lines         1029      833     -196     
===========================================
- Hits          1029      829     -200     
- Misses           0        4       +4     

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