Add GetPropertyAttribute method for Object in the API

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ac26061498fbb412aa44ebe4dcdba650996ce35e..b42e658a233202aab0dafca52c0ea294b9de8f75 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1458,6 +1458,14 @@ class Object : public Value {
 
   V8EXPORT Local<Value> Get(uint32_t index);
 
+  /**
+   * Gets the property attributes of a property.
+   * Can be None or any combination of ReadOnly, DontEnum and DontDelete.
+   *
+   * Note: Returns None when the property doesn't exist.
+   */
+  V8EXPORT PropertyAttribute GetPropertyAttributes(Handle<Value> key);
+
   // TODO(1245389): Replace the type-specific versions of these
   // functions with generic ones that accept a Handle<Value> key.
   V8EXPORT bool Has(Handle<String> key);