Add logic for resolving route handlers

src/http/routing/ActivatedRoute.ts

@@ -1,8 +1,9 @@
 import {ErrorWithContext} from "@extollo/util";
-import {Route} from "./Route";
+import {ResolvedRouteHandler, Route} from "./Route";
 
 export class ActivatedRoute {
     public readonly params: {[key: string]: string}
+    public readonly handler: ResolvedRouteHandler
 
     constructor(
         public readonly route: Route,
@@ -19,5 +20,6 @@ export class ActivatedRoute {
         }
 
         this.params = params
+        this.handler = route.resolveHandler()
     }
 }