Namespaced body in responses

[RemiKalbe]

Same issue as https://github.com/juhaku/utoipa/issues/152 but with body in responses

#[utoipa::path(
    responses(
        (status = 200, body = response::WillNotWork),
    ),
)]

Tried on master.

[juhaku]

Response body and request body is resolved in elsewhere thus not supporting path expression. This needs a change to current implementation. I'll note this to the project's kanban board as well.

[juhaku]

From #408 the types of response body and request body are parsed with the same logic as types of the ToSchema and IntoParams structs are. This should allow defining types with paths similarly.