chore: Tag everything currently unused as legacy.

extensions/default/src/DicomWebDataSource/wado/retrieveMetadataLoaderAsync.js

@@ -1,10 +1,7 @@
 import dcmjs from 'dcmjs';
-import { studies } from '@ohif/core';
+import { sortStudySeries, sortingCriteria } from '../utils/sortStudy';
 import RetrieveMetadataLoader from './retrieveMetadataLoader';
 
-const { sortStudySeries, sortingCriteria } = studies;
-
-
 /**
  * Creates an immutable series loader object which loads each series sequentially using the iterator interface
  * @param {DICOMWebClient} dicomWebClient The DICOMWebClient instance to be used for series load