Add removeAll function to react wrapper

Author: YOUNGHO8762

react/lib/grid-stack-context.ts

@@ -13,6 +13,7 @@ export const GridStackContext = createContext<{
     ) => Omit<GridStackWidget, "id">
   ) => void;
   saveOptions: () => GridStackOptions | GridStackWidget[] | undefined;
+  removeAll: () => void;
 
   _gridStack: {
     value: GridStack | null;

react/lib/grid-stack-provider.tsx

@@ -91,6 +91,11 @@ export function GridStackProvider({
     return gridStack?.save(true, true, (_, widget) => widget);
   }, [gridStack]);
 
+  const removeAll = useCallback(() => {
+    gridStack?.removeAll();
+    setRawWidgetMetaMap(new Map<string, GridStackWidget>());
+  }, [gridStack]);
+
   return (
     <GridStackContext.Provider
       value={{
@@ -101,6 +106,7 @@ export function GridStackProvider({
         removeWidget,
         addSubGrid,
         saveOptions,
+        removeAll,
 
         _gridStack: {
           value: gridStack,