Store embeddings in Qdrant or SQLite-vss

[brainless]

As a user I would like to store embedding into a vector databases.

Engineering notes

We can use Qdrant and SQLite-vss as options. SQLite-vss would make immediate sense since we use SQLite for our internal storage. Qdrant can be used if there are additional benefits or can be postponed to a later stage as and when we need.

[brainless]

Finally decided to use Qdrant since SQLite-vss seems to be under a re-write.