feat: Add customization support for more UI components (#4634)

Co-authored-by: ashikcn <ashik@L1140.trenser.com>
Co-authored-by: Devu Jayalekshmi <devu.jayalekshmi@trenser.com>
Co-authored-by: Arul Mozhi <arul.mozhi@trenser.com>

extensions/cornerstone-dicom-rt/src/viewports/OHIFCornerstoneRTViewport.tsx

@@ -1,6 +1,6 @@
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import PropTypes from 'prop-types';
-import { LoadingIndicatorTotalPercent, ViewportActionArrows } from '@ohif/ui';
+import { ViewportActionArrows } from '@ohif/ui';
 import { useViewportGrid } from '@ohif/ui-next';
 
 import promptHydrateRT from '../utils/promptHydrateRT';
@@ -39,6 +39,10 @@ function OHIFCornerstoneRTViewport(props: withAppTypes) {
     throw new Error('RT viewport should only have a single display set');
   }
 
+  const LoadingIndicatorTotalPercent = customizationService.getCustomization(
+    'ui.loadingIndicatorTotalPercent'
+  );
+
   const rtDisplaySet = displaySets[0];
 
   const [viewportGrid, viewportGridService] = useViewportGrid();