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Implement `ByteStr` and `ByteString` types Approved ACP: https://github.com/rust-lang/libs-team/issues/502 Tracking issue: https://github.com/rust-lang/rust/issues/134915 These types represent human-readable strings that are conventionally, but not always, UTF-8. The `Debug` impl prints non-UTF-8 bytes using escape sequences, and the `Display` impl uses the Unicode replacement character. This is a minimal implementation of these types and associated trait impls. It does not add any helper methods to other types such as `[u8]` or `Vec<u8>`. I've omitted a few implementations of `AsRef`, `AsMut`, and `Borrow`, when those would be the second implementation for a type (counting the `T` impl), to avoid potential inference failures. We can attempt to add more impls later in standalone commits, and run them through crater. In addition to the `bstr` feature, I've added a `bstr_internals` feature for APIs provided by `core` for use by `alloc` but not currently intended for stabilization. This API and its implementation are based *heavily* on the `bstr` crate by Andrew Gallant (`@BurntSushi).` r? `@BurntSushi`