Implement serializeSelf/deserializeSelf for Map, Set, and WeakMap

[tejaede]

This PR allows for serialization of native Map, Set, and WeakMap. Instead of pointing the serialization prototype to a moduleId, it points to the constructor directly e.g. "prototype": "Map"

Set

Set#deserializeSelf() looks for a values property. Set#serializeSelf() generates this structure

{
    "root": {
        "prototype": "Set",
        "values": {
             "values": ["A", "B", "C", "D"]
        }
   }
}

Map & Weak Map

Map#deserializeSelf() and WeakMap#deserializeSelf() support the same serialization structures. Each can be serialized in two ways.

1. With keys and values arrays where keys[i] ==> values[i]
   This structure is more efficient to deserialize than the second so Map#serializeSelf() and WeakMap#serializeSelf() both produce this version.

{
    "root": {
        "prototype": "Map",
        "values": {
             "keys": ["A", "B", "C", "D"]
             "values": [1, 2, 3, 4]
        }
    }
}

2. With an entries array where each item in the array is an object with a key and value property

{
    "root": {
        "prototype": "WeakMap",
        "values": {
             "entries": [
                   {"key": {"name": "Paul"}, "value": "McCartney"},
                   {"key": {"name": "John"}, "value": "Lennon"}
             ]
         }
    }
}

[marchant]

Looks good!