rust: str: implement `Display` and `Debug` for `BStr`

Currently, `BStr` is just a type alias of `[u8]`, limiting its
representation to a byte list rather than a character list, which is not
ideal for printing and debugging.

Implement `Display` and `Debug` traits for `BStr` to facilitate easier
printing and debugging.

Also, for this purpose, change `BStr` from a type alias of `[u8]` to a
struct wrapper of `[u8]`.

Co-developed-by: Virgile Andreani <[email protected]>
Signed-off-by: Virgile Andreani <[email protected]>
Signed-off-by: Yutaro Ohno <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/ZcSlGMGP-e9HqybA@ohnotp
[ Formatted code comment. ]
Signed-off-by: Miguel Ojeda <[email protected]>

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