Bumping pydantic >= 2.0.0

[jannisborn]

Problem:

• HF Spaces apps are getting down due to deprecated gradio version
• Compliant gradio version relies on pydantic 2.*
• GT4SD relies on pydantic 1.*

--> Goal: Bump pydantic

Refactor is largely done but not all tests are passing yet.

Without the hacky line

            VanillaConfiguration.__pydantic_validator__ = True  # type: ignore

we get:

TypeError: Parameter list to Generic[...] cannot be empty

It would be best to find a way to have a non-empty parameter list here.

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[drugilsberg]

Great work, few comments.

[fiskrt]

Can we merge?

[drugilsberg]

LGTM