Add objLength and isObjEmpty util fns (#3605)

### Description

Add `objLength` and `isObjEmpty` utils

### Related issues

Fixes https://github.com/hyperlane-xyz/issues/issues/1199

### Backward compatibility

Yes

.changeset/poor-kings-fold.md

@@ -0,0 +1,5 @@
+---
+'@hyperlane-xyz/utils': patch
+---
+
+Add objLength and isObjEmpty utils

typescript/utils/src/index.ts

@@ -100,9 +100,11 @@ export {
   deepCopy,
   deepEquals,
   invertKeysAndValues,
+  isObjEmpty,
   isObject,
   objFilter,
   objKeys,
+  objLength,
   objMap,
   objMapEntries,
   objMerge,

typescript/utils/src/objects.ts

@@ -17,6 +17,14 @@ export function objKeys<T extends string | number>(obj: Record<T, any>): T[] {
   return Object.keys(obj) as T[];
 }
 
+export function objLength(obj: Record<any, any>) {
+  return Object.keys(obj).length;
+}
+
+export function isObjEmpty(obj: Record<any, any>) {
+  return objLength(obj) === 0;
+}
+
 export function objMapEntries<
   M extends Record<K, I>,
   K extends keyof M,