Add DartPackage annotation to all mojo_services mojoms

mojo/services/network/public/interfaces/host_resolver.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+[DartPackage="mojo_services"]
 module mojo;
 
 import "mojo/public/interfaces/network/network_error.mojom";
 import "network/public/interfaces/net_address.mojom";
 
 interface HostResolver {
   // Get the list of IP addresses for host.
   GetHostAddresses(string host, NetAddressFamily family) =>
       (NetworkError result, array<NetAddress>? addresses);
 };