Add `format: uuid` in the openapi spec generation for UUID strings

Hello!

Looks like `uuid` string validation is [supported in huma](https://github.com/danielgtaylor/huma/blob/badf024b0795f089518475622985ca899c98e41e/docs/docs/features/request-validation.md?plain=1#L146), however when the openapi spec is generated it is not mentioned as a validation requirement for the string with `format: uuid`. Heres the openapi spec for `uuid`: https://spec.openapis.org/registry/format/uuid.html

Can we fix openapi generation for string formats (uuid, and any others)?