OAuth for Client/Server Authentication and Authorization

Just skimming the top of the list as sorted by `Dependencies / squared size`, I think these would be good candidates: Crate | Notes ---|--- hex | convert bytes to and from hexadecimal. Could be an extension to #138215 maybe urlencoding & percent-encoding | encode and decode url strings byteorder | convinence methods for encoding and decoding big and little endian fastrand | when you just want some "random" looking numbers and don't care about making them unpredictable (or where being predictable may be wanted) walkdir | recursive iteration of directories; super useful but maybe std would want to pick a subset of this tempfile | create anonymous or named temporary files and clean them up on drop Except for the last two, these could be in core. Or at least some subset of them could be.

Let's make Base64 better for some web standards in Foundation! 🚀 https://forums.swift.org/t/pitch-adding-base64-urlencoding-and-omitting-padding-options-to-base64-encoding-and-decoding/77659