refactor: Reduce bundle size (#1575)

* async load cornerstoneWADOImageLoader chunk

* Lazy initializing of CornerstoneWADIImageLoader - delayed till Viewer creation

* Async loading of react-vtkjs-viewport

* withCornerstone HOC to wrap routes requiring CornerstoneWADOImageLoader initiazation

* removed dead code in comments

* initWeWorkers is no more. Remove al its references.

Co-authored-by: kedar.netelixir <kedar.choudhary@netelixir.com>
Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>

platform/viewer/src/routes/routesUtil.js

@@ -1,4 +1,5 @@
 import asyncComponent from '../components/AsyncComponent.js';
+import { withCornerstone } from '../utils/cornerstoneWADOImageLoader';
 
 import OHIF from '@ohif/core';
 const { urlUtil: UrlUtil } = OHIF.utils;
@@ -9,8 +10,10 @@ const IHEInvokeImageDisplay = asyncComponent(() =>
     /* webpackChunkName: "IHEInvokeImageDisplay" */ './IHEInvokeImageDisplay.js'
   )
 );
-const ViewerRouting = asyncComponent(() =>
-  import(/* webpackChunkName: "ViewerRouting" */ './ViewerRouting.js')
+const ViewerRouting = withCornerstone(
+  asyncComponent(() =>
+    import(/* webpackChunkName: "ViewerRouting" */ './ViewerRouting.js')
+  )
 );
 
 const StudyListRouting = asyncComponent(() =>
@@ -18,12 +21,18 @@ const StudyListRouting = asyncComponent(() =>
     /* webpackChunkName: "StudyListRouting" */ '../studylist/StudyListRouting.js'
   )
 );
-const StandaloneRouting = asyncComponent(() =>
-  import(/* webpackChunkName: "ConnectedStandaloneRouting" */ '../connectedComponents/ConnectedStandaloneRouting.js')
+const StandaloneRouting = withCornerstone(
+  asyncComponent(() =>
+    import(
+      /* webpackChunkName: "ConnectedStandaloneRouting" */ '../connectedComponents/ConnectedStandaloneRouting.js'
+    )
+  )
 );
-const ViewerLocalFileData = asyncComponent(() =>
-  import(
-    /* webpackChunkName: "ViewerLocalFileData" */ '../connectedComponents/ViewerLocalFileData.js'
+const ViewerLocalFileData = withCornerstone(
+  asyncComponent(() =>
+    import(
+      /* webpackChunkName: "ViewerLocalFileData" */ '../connectedComponents/ViewerLocalFileData.js'
+    )
   )
 );