support for hnswlib-rs

[jianshu93]

Dear Feder team,

The Rust version Hnswlib (https://github.com/jean-pierreBoth/hnswlib-rs) is way more attractive than the C++ version, which provides thread-safe multi-threading hnsw index construction and search. and also PyO3 is very easy to allow direct translation from Rust code to python functions. In addition to this, many more distance functions were provided in Rust version hnswlib, e.g., L1, L2, Cosine, Jaccard, Hamming for vectors of standard numeric types, Levenshtein distance on u16.

I am wondering whether it is possible to add a rust version Hnswlib support. It will be very useful in many cases.

Thanks,

Jianshu