add shallow compare util

frontend/app/utils/shallowCompare.ts

@@ -0,0 +1,10 @@
+export function shallowCompare<T extends object>(a: T, b: T): boolean {
+  const entriesA = Object.entries(a);
+  const keysB = Object.keys(b);
+  if (entriesA.length !== keysB.length) return false;
+  for (const [key, value] of entriesA) {
+    // @ts-ignore
+    if (value !== b[key]) return false;
+  }
+  return true;
+}