Elixir bindings

[joelpaulkoch]

This PR moves the sqlite_vec package into this repository.

Here the remaining open points:

License

I'm guessing you would want to copy the Apache and MIT license from the root repository? In any case, after updating the license, we must make sure it's included in the published package on hex.

Transfer ownership of the package on hex

I can transfer the ownership of the package on hex.pm. If you give me the go, I'll do that with this user.

CI

I've included my github workflows file, not sure what you want to do with that.

[MiraiTunga]

Can this be merged?

[joelpaulkoch]

You can use the package as git dependency in mix: https://github.com/joelpaulkoch/sqlite_vec.

I want to refactor the PR so that it doesn't depend on octo_fetch. Instead we can use elixir_make, this way we don't have a runtime dependency and it will integrate better with the ecosystem (cross compilling with burrito, probably also nerves).
I expect this to work pretty good given that we can just reuse the existing Makefile, sqlite-vec.c and sqlite-vec.h.

[asg017]

@joelpaulkoch lmk if I can help with that in anyway! A no-dep Makefile option would be awesome