Don't make duplicated requests through Ember Data

ember-data-storefront provides FastbootAdapter which caches XHRs in
Fastboot's Shoebox.

This will prevent duplicated requests on /crates and other
Ember Data-powered pages.

Author: kzys

app/adapters/application.js

@@ -1,9 +1,10 @@
 import RESTAdapter from '@ember-data/adapter/rest';
 import { inject as service } from '@ember/service';
 import { computed } from '@ember/object';
+import FastbootAdapter from 'ember-data-storefront/mixins/fastboot-adapter';
 
-export default RESTAdapter.extend({
-  fastboot: service(),
+export default RESTAdapter.extend(FastbootAdapter, {
+  fetcher: service(),
 
   namespace: 'api/v1',