complete hide action part with button for hide or show all table header

src/core/utils/flattenObjectOfObjects.jsx

@@ -0,0 +1,12 @@
+export const flattenObjectOfObjects = (obj, res = {}) => {
+    for (let key in obj) {
+        if (obj.hasOwnProperty(key)) {
+            if (typeof obj[key] === "object" && obj[key] !== null) {
+                flattenObjectOfObjects(obj[key], res);
+            } else {
+                res[key] = obj[key];
+            }
+        }
+    }
+    return res;
+};