Enhancement: Set `additionalProperties` in schema based on Pydantic's `extra` config

[edgarrmondragon]

Summary

Similar to how Pydantic generates its own schemas:

https://github.com/pydantic/pydantic/blob/62d70d1632c121c7d10095abf9174f660b0f5860/pydantic/json_schema.py#L1580-L1585

Basic Example

No response

Drawbacks and Impact

No response

Unresolved questions

No response