Add sqlite stub library

crates/lb_sqlite/Cargo.toml

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+[package]
+name = "lb_sqlite"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+homepage.workspace = true
+repository.workspace = true
+
+[dependencies]
+lb = { path = "../lb", features = ["time"] }
+luaffi = { version = "0.0.1", path = "../luaffi" }
+rusqlite = { version = "0.36.0", features = ["bundled", "load_extension", "backup", "blob", "limits", "window", "series", "session", "collation", "serialize"] }

crates/lb_sqlite/src/lib.rs

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+//! luby SQLite library.
+#[path = "mod.rs"]
+pub mod sqlite;

crates/lb_sqlite/src/mod.rs

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+//! SQLite library.
+//!
+//! The `lb:sqlite` library provides an interface to SQLite databases.
+//!
+//! ## Exports
+//!
+//! See [`lb_sqlitelib`] for items exported by this library.
+use luaffi::{cdef, metatype};
+
+/// Items exported by the `lb:sqlite` library.
+///
+/// This library can be acquired by calling
+/// [`require("lb:sqlite")`](https://www.lua.org/manual/5.1/manual.html#pdf-require).
+///
+/// ```lua
+/// local sqlite = require("lb:sqlite");
+/// ```
+#[cdef(module = "lb:time")]
+pub struct lb_sqlitelib;
+
+#[metatype]
+impl lb_sqlitelib {
+    #[new]
+    extern "Lua-C" fn new() -> Self {
+        Self
+    }
+}