Pydantic v2 support for MSONable types

[munrojm]

Summary

This PR adds support for pydantic >= 2.0 with the addition of custom class validation methods to MSONable:

• __get_pydantic_json_schema__ to define pydantic field JSON schema
• __get_pydantic_core_schema__ to define pydantic field core schema

The same validation function is used for both versions.

[codecov]

Codecov Report

Patch coverage: 75.75% and project coverage change: -0.04% ⚠️

Comparison is base (b7460a1) 76.57% compared to head (6a56a6f) 76.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #548      +/-   ##
==========================================
- Coverage   76.57%   76.53%   -0.04%     
==========================================
  Files          27       27              
  Lines        1524     1547      +23     
  Branches      320      322       +2     
==========================================
+ Hits         1167     1184      +17     
- Misses        297      303       +6     
  Partials       60       60              

Files Changed	Coverage Δ
monty/json.py	85.88% <75.75%> (-0.89%)	⬇️

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[Andrew-S-Rosen]

Thanks, @munrojm! Very much looking forward to getting this merged. I'm not sure how picky @shyuep is with the codecov tests, but you're super close to the diff hit so if you need to you can probably add another test to get the lovely green check :)

[shyuep]

Merged. The codecov is just meant to check if something really has no tests. Here we are well covered.

[Andrew-S-Rosen]

Great, thanks! Would you mind minting a new release whenever you get a moment?

[shyuep]

Already done.

[Andrew-S-Rosen]

Beautiful!