rust: str: implement several traits for `CStr`

Implement `Debug`, `Display`, `Deref` (into `BStr`), `AsRef<BStr>`
and a set of `Index<...>` traits.

This makes it `CStr` more convenient to use (and closer to `str`).

Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Morgan Bartlett <mjmouse9999@gmail.com>
Signed-off-by: Morgan Bartlett <mjmouse9999@gmail.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>