feat(fastify): pass appRoute to route handlers (#591)

Co-authored-by: Youssef Gaber <1728215+Gabrola@users.noreply.github.com>

Author: dmstoykov

.changeset/mighty-bears-explain.md

@@ -0,0 +1,5 @@
+---
+'@ts-rest/fastify': minor
+---
+
+Pass `appRoute` to route handlers

libs/ts-rest/fastify/src/lib/ts-rest-fastify.ts

@@ -31,6 +31,7 @@ type AppRouteImplementation<T extends AppRoute> = (
   input: ServerInferRequest<T, fastify.FastifyRequest['headers']> & {
     request: fastify.FastifyRequest;
     reply: fastify.FastifyReply;
+    appRoute: T;
   },
 ) => Promise<ServerInferResponses<T>>;
 
@@ -228,6 +229,7 @@ const registerRoute = <TAppRoute extends AppRoute>(
           // eslint-disable-next-line @typescript-eslint/no-explicit-any
           body: validationResults.bodyResult.data as any,
           reply,
+          appRoute,
         });
       } catch (e) {
         if (e instanceof TsRestResponseError) {