[OHIF-235] Lazy processing of DICOM SR for viewport. (#1849)

* Only process SR on consumption of viewport.

* remove debugger

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

platform/viewer/src/components/ViewportGrid.jsx

@@ -110,6 +110,7 @@ function ViewerViewportGrid(props) {
 
       const displaySet =
         DisplaySetService.getDisplaySetByUID(displaySetInstanceUID) || {};
+
       const ViewportComponent = _getViewportComponent(
         displaySet.SOPClassHandlerId,
         viewportComponents