[Feature]: VectorChord extention as a replacement for PGVector

[qdrddr]

VectorChord offers

1. 1-but quantization search that speeds up search candidates and then search with full precision, that yeals significant overall retrieval latency improvement while not sacrificing accuracy.
2. Storing the Quantized vectors in the DB significantly reduces storage while sacrificing some of the recall accuracy (not released yet, available in the main branch)
3. BM25 Full Text Search available for HybridSearch (Vector + FTS)

https://github.com/tensorchord/VectorChord