Update database client installation commands

[s-h-a-d-o-w]

A few minor changes:

• Sort commands alphabetically
• Add lancedb
• Make commands copy-pasteable. See:

~/temp/vdbb 10svdbb ❯ uv pip install vectordb-bench[pgvector]
zsh: no matches found: vectordb-bench[pgvector]

~/temp/vdbbvdbb ❯ uv pip install 'vectordb-bench[pgvector]'
Resolved 93 packages in 715ms
Prepared 3 packages in 143ms
Installed 3 packages in 2ms
 + pgvector==0.5.0
 + psycopg==3.3.4
 + psycopg-binary==3.3.4

Please just let me know if you maybe don't want one of these changes and I'll undo that.

[sre-ci-robot]

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