Add sqlite-vec example

[tmc]

We should absolutely have a rock solid sqlite-vec example working end to end.

[devalexandre]

sqlite-vec

this sqlite-vec are WIP or have a some release?

[asg017]

FYI sqlite-vec now has stable releases (0.1.X), with official Go bindings described here: https://alexgarcia.xyz/sqlite-vec/go.html

Happy to help review/give feedback as needed! I'm not the best at Go so probably can't give a PR myself, but happy to review anything sqlite-vec related