[Enhancement] Support Pydantic v2

[XChikuX]

Pydantic v2 comes with several performance and safety benefits due to being compiled in Rust with python bindings.

I'd love to see the models: HashModel, JsonModel, EmbeddedJsonModel all use the new and improved pydantic.

There maybe a small migration workflow, which the pydantic team is building a tool for.

[bonastreyair]

take a look at https://docs.pydantic.dev/latest/migration/
also take a look at this tool that will automatically upgrade some of the changes for you: https://github.com/pydantic/bump-pydantic

[XChikuX]

So far, commit #533 does not successfully support Pydantic v2. Keeping this open.

[pr0ton11]

Also waiting for this to be supported.