Deprecate import inject from @ember/service (#2716)

* Deprecate usage of import inject

addons/api/addon/models/group.js

@@ -7,7 +7,7 @@ import GeneratedGroupModel from '../generated/models/group';
 import { attr } from '@ember-data/model';
 import { computed } from '@ember/object';
 import { A } from '@ember/array';
-import { inject as service } from '@ember/service';
+import { service } from '@ember/service';
 
 export default class GroupModel extends GeneratedGroupModel {
   // =services