4.0.1

[aembke]

• Switch decoder interface to use Bytes
• Switch Frame types to use Bytes/Str.
• Add decode_mut interface
• Update docs, tests
• Fix https://github.com/aembke/redis-protocol.rs/issues/18

[aembke]

cc @rukai if you want to take a look.

The primary decoder interface for both RESP2 and RESP3 uses Bytes, as do all of the Frame types. The complicated parsing needed for BytesMut is behind the decode-mut feature flag. I didn't want to make the &mut BytesMut decoder generic since I plan on optimizing that a bit more in the future, and that will likely be pretty invasive.

One other notable change - the SimpleString variants for both RESP2 and RESP3 now do not do any UTF-8 string parsing to support callers that use this with the MONITOR interface (since that interface can embed non-UTF8 byte slices inside a SimpleString frame). You also might want to keep this in mind in shotover-proxy in case you have any str::from_utf8 calls hidden in there.