design choice and benchmarks

[patelprateek]

I observe the usage of lmdb , sqlite , pq codec for hnsw
can you please provide some rationale on design choices here for example : rocksdb instead of lmdb , lucence vs sqlite3 for applying filters , why not use faiss hnsw that already supports quantization schemes like scalar and pq ?

[numb3r3]

Thanks for your suggestion. We will answer these questions in the FAQ section which will be included in the next release README.