Add possibility to override config

[pyropy]

Sometimes frontend devs just want that camelCase rather then your sweet snake_case, so you need to add custom pydantic config to your models :/

[codecov]

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[tiangolo]

Great, thanks! 🚀

I just added tests for it and it's now merged 🎉

[pyropy]

@tiangolo Sorry I havent written any tests. This is my first real open-source contribution, thank you for the merge :D