Reorganize method routers for handlers and services (#405)

* Re-organize method routing for handlers

* Re-organize method routing for services

* changelog

examples/todos/src/main.rs

@@ -16,9 +16,9 @@
 use axum::{
     error_handling::HandleErrorLayer,
     extract::{Extension, Path, Query},
-    handler::{get, patch},
     http::StatusCode,
     response::IntoResponse,
+    routing::{get, patch},
     Json, Router,
 };
 use serde::{Deserialize, Serialize};