chore(exports): Exposes hydration functions from seg and rt extensions (#3585)

extensions/cornerstone-dicom-rt/src/index.tsx

@@ -2,6 +2,7 @@ import { id } from './id';
 import React from 'react';
 import { Types } from '@ohif/core';
 import getSopClassHandlerModule from './getSopClassHandlerModule';
+import hydrateRTDisplaySet from './utils/_hydrateRT';
 
 const Component = React.lazy(() => {
   return import(
@@ -61,3 +62,4 @@ const extension: Types.Extensions.Extension = {
 };
 
 export default extension;
+export { hydrateRTDisplaySet };