fix pydantic json-schema serialization

[mperesson]

Using DataURI as a type in my pydantic model with fastapi, it made the openapi documentation generation crash.

This is because it tried to serialize python function and method that came from __get_pydantic_core_schema__.

I rewrote __get_pydantic_json_schema__ based on the pydantic doc (https://docs.pydantic.dev/2.10/concepts/json_schema/#implementing-__get_pydantic_json_schema__) so it only contains serializable types.

[fcurella]

Thank you!

[mperesson]

looks like you don't run linter on PR 😬
sorry!