ECMA 6 - Implement Map and Set Objects

The runtime need to has the visitor for the Map and Set objects.
For this implementation please check [these](https://www.ecma-international.org/ecma-262/6.0/index.html#sec-map-objects) [links](https://www.ecma-international.org/ecma-262/6.0/index.html#sec-set-objects) related to current supported specification.