libsql sqlite support

[hbjydev]

It would be really cool to see support for libsql included in Toasty. I love the DX of using it currently, but I mainly use libsql for its performance and replication layer when running the server component.

I'd be happy to look at what would be necessary to add this. Maybe as a feature of the sqlite DB crate? (i.e. have the default implementation use rusqlite but allow use of libsql if you enable it)

[hbjydev]

PR #79 raised with my draft of an implementation of this. :)