databases/turso: New port

Turso is an open-source, SQLite-compatible database written in Rust that
lets developers create millions of small, file-based databases for AI
agents, multi-tenant SaaS applications, and edge workloads.

Unlike traditional databases that run as a single shared server process,
Turso treats each database as a lightweight file that can be spun up
instantly, replicated globally, or synced to a device.