[WIP] fs: feature detection for recursive mkdir[Sync]

[MylesBorins]

This commit adds a non-enumerable and non-writable property
Symbol('recursive') to fs.mkdir and fs.mkdirSync to allow developers
to feature detect

This PR adds a known symbol util.features that can be used to do feature detection on particular APIS.

How it can be used:

edited:

fs.mkdir[util.features].recursive
// true