libsql and vector search

[rhashimoto]

libsql is a fork of SQLite developed by Turso.

I don't have any immediate plans to build wa-sqlite against libsql by default, but it turns out to be quite easy to do that. It's just a few tweaks to the Makefile. That change and the resulting WebAssembly builds are on this branch. I don't promise to support the branch but it seems to work and passes the existing tests.

Why is this interesting? libsql has added some features to the base SQLite library. Not all of them will be available or useful from wa-sqlite, but one in particular is currently a popular topic: vector search.

So if you want to experiment with vector search or some other libsql feature in the browser, this is an option.