feat: add SQLite storage backend for multi-process optimization

src/storage/mod.rs

@@ -8,12 +8,16 @@
 
 #[cfg(feature = "journal")]
 mod journal;
+#[cfg(feature = "sqlite")]
+mod sqlite;
 
 use std::sync::Arc;
 
 #[cfg(feature = "journal")]
 pub use journal::JournalStorage;
 use parking_lot::RwLock;
+#[cfg(feature = "sqlite")]
+pub use sqlite::SqliteStorage;
 
 mod memory;
 pub use memory::MemoryStorage;