Rename the pg_bm25 to pg_search

[Vonng]

trafficstars

Now we have to recomiple the RUST extension, and modify all the references in the images, docs, and config templates.

https://github.com/paradedb/paradedb/tree/dev/pg_search

[Vonng]

And also bump pg_search, pg_analytics & pg_sparse to v0.6.1

[Vonng]

resolved in https://github.com/Vonng/pigsty/commit/66de79bbd6cd43e97fa294812233787c6c61cbd3