[poem-openapi] How about put some common attributes on the impl scope?

[umaYnit]

Description of the feature

How about put some common attributes on the impl scope?
such as prefix_path and openapi tag.

Code example (if possible)

#[OpenApi]
#[oai(prefix_path = "/pet", tag = ApiTags::Pet)]
impl Api {
    #[oai(path = "/", method = "post")]
    async fn add_pet(&self, pet: Json<Pet>) -> Result<()> {
        todo!()
    }
// ...
}

[ollyde]

For anyone else who reads this and can't find docs.

#[OpenApi(prefix_path = "/api", tag = "ApiTags::Test")]
impl TestRoutesApi {}