fix: new interface of pgvecto.rs after v0.2

[cutecutecat]

Close #265

This PR migrated to new interface of pgvecto.rs after v0.2:

• Operator l2_ops ->vector_l2_ops
• Operator dot_ops ->vector_dot_ops
• Operator cosine_ops ->vector_cos_ops
• Option algorithm ->indexing
• Option indexing.ivf.nprob ->indexing.ivf.nsample
• Add vectors to search_path for schema requirement

And connect to the new index type:

• IVFSQ8 = indexing.ivf + scaler quantization at pgvecto.rs

Apart from that, we fix a requirement bug for pgvector:

• sqlalchemy -> psycopg2

How to test it

Please use one of these images to test:

• Most Recommand: tensorchord/pgvecto-rs:pg16-v0.0.0-nightly.20240410
• tensorchord/pgvecto-rs:pg16-v0.3.0-alpha.1
• tensorchord/pgvecto-rs:pg16-v0.2.1

tensorchord/pgvecto-rs:pg16-v0.0.0-nightly.20240410 will be our official v0.3.0 in recent weeks.

How to run image

For image tensorchord/pgvecto-rs:pg16-v0.0.0-nightly.20240410:

docker run  --name pgvecto-rs-demo  \
-e POSTGRES_PASSWORD=mysecretpassword -p 5432:5432   \
-d tensorchord/pgvecto-rs:pg16-v0.0.0-nightly.20240410

Field at Benchmark Webpage

password=mysecretpassword
db_name=postgres

Supported Index types

• HNSW
• IVF_FLAT
• FLAT
• IVF_SQ8 [recently introduced]

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