feat: expose setReactRouterDevLoadContext function

Author: albertusdev

packages/react-router-dev/vite.ts

@@ -1 +1,4 @@
-export { reactRouterVitePlugin as reactRouter } from "./vite/plugin";
+export {
+  reactRouterVitePlugin as reactRouter,
+  setReactRouterDevLoadContext,
+} from "./vite/plugin";