Added getOwnPropertyDescriptors to es2017.object

As per recommendation in https://github.com/Microsoft/TypeScript/pull/15280/files/26150d97951039a1a4bd2c9ac4f9145325154716#r113041822

Author: taras

lib/lib.es2017.object.d.ts

@@ -42,4 +42,10 @@ interface ObjectConstructor {
      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
      */
     entries(o: any): [string, any][];
+ 
+     /**
+      * Returns an object containing all own property descriptors of an object
+      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
+      */
+     getOwnPropertyDescriptors<T>(o: T): {[P in keyof T]: TypedPropertyDescriptor<T[P]>} & { [x: string]: PropertyDescriptor };
 }