This PR adds a safe wrapper around JavaScript `JsSet` from `builtins::set`, and is being tracked at #2098.
Implements following methods
- [x] `Set.prototype.size`
- [x] `Set.prototype.add(value)`
- [x] `Set.prototype.clear()`
- [x] `Set.prototype.delete(value)`
- [x] `Set.prototype.has(value)`
- [x] `Set.prototype.forEach(callbackFn[, thisArg])`
Implement wrapper for `builtins::set_iterator`, to be used by following.
- [x] `Set.prototype.values()`
- [x] `Set.prototype.keys()`
- [x] `Set.prototype.entries()`
*Note: Are there any other functions that should be added?
Also adds `set_create()` and made `get_size()` public in `builtins::set`.
Anuvrat Singh