Add a feature in pgvector to support pgvectorscale.

[pradhakrishnan]

Add a support to use pgvectorscale extension from Timescale.

Expected Behavior

pgvectorscale is a open source extension from Timescale. It had a additional support of diskann index (https://www.timescale.com/learn/hnsw-vs-diskann) and timebased UUID.

Current Behavior

Current pgvector extension does't support the DiskANN index.

Context

Add an additional parameter in pgvector configuration to support pgvectorscale and create extension timescaledb and vectorscale in the initializationSchema.