[GSK-1745] Support both Pydantic 1 & 2

[Hartorn]

Description

Major issues encountered :

• base settings is in a different package for pydantic v2
  • handling it with extra deps was not working, since pdm was not installing it
  • since it's used only in one class, just doing the behaviour by hand
• validate_arguments was renamed validate_call in pydantic v2
• validate_call works only on types, so was creating issues to pickle code on SlicingFunction, TransformationFunction, and test decorator
• validate_call has been moved inside decorator

Everything else is only minor changes to enforce types and respect pydantic validation

[linear]

GSK-1745 Upgrade pydantic to 2.0+

Several users have faced dependency issues because of our strict requirement for pydantic versions. Need to investigate what it takes to do this. Possible issue: libraries we rely on might still rely on older versions of pydantic

[sonarqubecloud]

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