[Feature] derive utoipa's `ToSchema` trait for primitives

[siosw]

Component

primitives

Describe the feature you would like

motivation: when creating rest APIs on top of alloy primitives it would be nice to have an easy way of creating openAPI specs via https://docs.rs/utoipa/latest/utoipa/trait.ToSchema.html

this should be behind a feature gate ofc, happy to put up a PR if there is interest.

alternatively this could also be a PR to https://github.com/juhaku/utoipa which provides impls for some external crates but alloy might be too niche for them

Additional context

No response