Add function in payload instead of just metadata (#1919)

Passing information of function from router to executor is more efficient than calling the K8S API. This change does that instead of passing only metadata and then executor calling the K8S API again.

pkg/executor/executor_test.go

@@ -256,7 +256,7 @@ func TestExecutor(t *testing.T) {
 
 	// the main test: get a service for a given function
 	t1 := time.Now()
-	svc, err := poolmgrClient.GetServiceForFunction(context.Background(), &f.ObjectMeta)
+	svc, err := poolmgrClient.GetServiceForFunction(context.Background(), f)
 	if err != nil {
 		log.Panicf("failed to get func svc: %v", err)
 	}