Add support for middleware

src/http/routing/Middleware.ts

@@ -0,0 +1,16 @@
+import {AppClass} from "../../lifecycle/AppClass"
+import {Request} from "../lifecycle/Request"
+import {ResponseObject} from "./Route"
+
+export abstract class Middleware extends AppClass {
+    constructor(
+        protected readonly request: Request
+    ) { super() }
+
+    protected container() {
+        return this.request
+    }
+
+    // Return void | Promise<void> to continue request
+    public abstract apply(): ResponseObject
+}