Suggestion: upgrade to rapidhash

Hello,

I've written a [rapidhash](https://github.com/hoxxep/rapidhash) rust crate, which is the [official successor to wyhash](https://github.com/wangyi-fudan/wyhash).

rapidhash is faster, equally as portable as wyhash, and with stronger hashing characteristics. Let me know if you would be interested in replacing wyhash with rapidhash and I can prep a pull request. Thanks!

Cheers,
Liam

Start by locating the existing wyhash integration in the Rust crate and checking rapidhash compatibility and performance claims. No file or test is named; completion would require an agreed migration scope plus validation that the existing library tests still pass.

Written by the indexing model from the issue text.