Extract CratePath and CrateVersionPath structs

[Turbo87]

These structs can be used as axum extractors for the corresponding Path patterns. At the same time, they implement utoipa::IntoParams, which allows them to be used in #[utoipa::path(params(CratePath), ...) form, which adds them to the generated OpenAPI description.

Related:

• Add an HTTP API reference, if stable #741
• Use utoipa crates to generate and serve basic OpenAPI description #10186
• utoipa: Add annotations to (almost) all endpoints #10201
• utoipa: Rename route handler fns to remove operation_id attributes #10207