Rapidhash Unity port

Ten years ago I was writing about various non-cryptographic hash functions. Back then xxHash was new (introduced in 2014)! However, quite some things have changed since then. xxHash itself got a new “XXH3” version (2020); “wyhash” appeared (2020+), and eventually evolved into “rapidhash” (2024+). Many others too, but this is about rapidhash. It is small and beautiful. Yes, current (V3) version is over 500 lines of C code, but that is three hash function variants and several tweaking options.