Add data validation support using Pydantic models.

[fabiocaccamo]

Fix #471

[codecov]

Codecov Report

Attention: Patch coverage is 92.10526% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.65%. Comparing base (560e0ce) to head (8e19a19).

Files with missing lines	Patch %	Lines
benedict/utils/pydantic_util.py	84.21%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   97.76%   97.65%   -0.11%     
==========================================
  Files          63       64       +1     
  Lines        2011     2045      +34     
==========================================
+ Hits         1966     1997      +31     
- Misses         45       48       +3     

Flag	Coverage Δ
unittests	97.65% <92.10%> (-0.11%)	⬇️

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