refactor(RootSiblingsManager): Updates the component structure and exports the default root component.

- Modifies the `wrapRootComponent` return value to include the root component.
- Adds a `DefaultRootSiblingParent` export for external access to the root component.
- Refactors the component initialization logic to support the new return structure.

Author: William

src/RootSiblingsManager.tsx

@@ -22,7 +22,7 @@ export function setSiblingWrapper(wrapper: (sibling: ReactNode) => ReactNode) {
   siblingWrapper = wrapper;
 }
 
-const { manager: defaultManager } = wrapRootComponent(
+const { Root, manager: defaultManager } = wrapRootComponent(
   ChildrenWrapper,
   renderSibling
 );
@@ -41,6 +41,8 @@ function getActiveManager(id: string | number | symbol): RootSiblingManager {
   return defaultManager;
 }
 
+export { Root as DefaultRootSiblingParent };
+
 export default class RootSiblingsManager {
   private id: string;
   private manager: RootSiblingManager;