add usePreloadRoute export

Author: kinooyume

src/index.tsx

@@ -12,6 +12,7 @@ export {
   useResolvedPath,
   useSearchParams,
   useBeforeLeave,
+  usePreloadRoute
 } from "./routing.js";
 export { mergeSearchString as _mergeSearchString } from "./utils.js";
 export * from "./data/index.js";