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

* Deprecate usage of import inject

addons/api/addon/models/base.js

@@ -6,7 +6,7 @@
 import Model from '@ember-data/model';
 import { attr } from '@ember-data/model';
 import { computed } from '@ember/object';
-import { inject as service } from '@ember/service';
+import { service } from '@ember/service';
 
 /**
  * Base model class provides common functionality for all models.