Finalize pydantic v2

[mansenfranzen]

Current docs build based on v2: here

There is still some work to do until the release for v2. Following points have to be done:

• Fix failing tests for python 3.7/3.8
• Fix failing sphinx build test
• Check entire documentation for pydantic v1 incompatibilities
  • Remove obsolete config options from rst in examples
  • Adjust to changed naming conventions like root validator -> model validator
• Document changed behavior from v1 -> v2 regarding autodoc_pydantic
• Update changelog
• Remove compatibility layer from v1 versions in testing modules
• Fix linting issues
• Provide release candidate for testing
• Add new contributors

@awoimbee & @PriOliveira feel free to review or to provide any other code contributions.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main-2.x@4af0249). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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##             main-2.x     #162   +/-   ##
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  Coverage            ?   94.39%           
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  Files               ?       12           
  Lines               ?     1052           
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  Hits                ?      993           
  Misses              ?       59           
  Partials            ?        0           

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[mansenfranzen]

@all-contributors please add @PriOliveira for review, userTesting

[allcontributors]

@mansenfranzen

I've put up a pull request to add @PriOliveira! 🎉