feature request: integrate with `bstr` crate

[al8n]

Hi, Rust's str/String can only contain the Unicode scalar values, but in some DSLs, they support any Unicode code point. By integrating with bstr::BStr, users can handle those DSLs instead of using Vec<u8>.

[zesterer]

What would this integration look like? Chumsky already supports byte slices as inputs.