add a TypedMethod trait/derive similar to TypedPath

[Zizico2]

Motivation

Defining an entire path in the same place, on the same struct (missing query params?) seems useful to me. It also matches what actix-web, rocket or poem macros provide.

Solution

A TypedMethod trait/derive easily allows the method to be co-located with the path.

Usage:

#[tokio::main]
async fn main() {
    let app = Router::new().typed(get_user);

    let listener = TcpListener::bind("127.0.0.1:3000")
        .await
        .expect("failed to bind 127.0.0.1:3000");

    println!("Listening on http://127.0.0.1:3000");

    axum::serve(listener, app).await.expect("server error");
}

async fn get_user(UsersMember { id }: UsersMember) -> String {
    format!("User {id} is ready")
}

#[derive(TypedMethod, TypedPath, Deserialize)]
#[typed_method(MethodFilter::GET)]
#[typed_path("/users/{id}")]
struct UsersMember {
    id: u32,
}

Would this be considered? It's missing comments and tests if needed.