Map.prototype.entries() method not implemented

[croraf]

ECMASCript feature
https://www.ecma-international.org/ecma-262/11.0/index.html#sec-map.prototype.entries
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Example code

const map1 = new Map();

map1.set('0', 'foo');
map1.set(1, 'bar');

const iterator1 = map1.entries();

console.log(iterator1.next().value);
// expected output: ["0", "foo"]

console.log(iterator1.next().value);
// expected output: [1, "bar"]

[croraf]

I'm trying some implementation. I basically duplicated the ArrayIterator functionality, and tried to fit in the missing types.