chore: import upstream snapshot with attribution

modules/core/misc/objc/common/ArrayUtil.h

@@ -0,0 +1,16 @@
+//
+//  ArrayUtil.h
+//
+//  Created by Giles Payne on 2020/02/09.
+//
+
+#pragma once
+
+#import <Foundation/Foundation.h>
+
+/**
+* Utility function to create and populate an NSMutableArray with a specific size
+* @param size Size of array to create
+* @param val Value with which to initialize array elements
+*/
+NSMutableArray* createArrayWithSize(int size, NSObject* val);