Adapt endpoint response (object collection) to entities format (array)

The statuses endpoint returns a collection as object,
being the keys the corresponding slug of the status.
However, the entities expect to work with arrays.
Providing the key to the entity config they'll be automatically
adapted from the object collection to an array.

packages/core-data/src/entities.js

@@ -230,6 +230,7 @@ export const rootEntitiesConfig = [
 		baseURL: '/wp/v2/statuses',
 		baseURLParams: { context: 'edit' },
 		plural: 'postStatuses',
+		key: 'slug',
 	},
 ];