Update dependencies and add new features for improved functionality

- Updated Cargo.lock and Cargo.toml to include new dependencies
- Added new files for backup and watcher functionality in libmarlin
- Introduced integration tests and documentation updates
- Set workspace resolver to version 2 for better dependency resolution

libmarlin/Cargo.toml

@@ -7,9 +7,13 @@ publish = false
 [dependencies]
 anyhow             = "1"
 chrono             = "0.4"
+crossbeam-channel  = "0.5"
 directories        = "5"
 glob               = "0.3"
+notify             = "6.0"
+priority-queue     = "1.3"
 rusqlite           = { version = "0.31", features = ["bundled", "backup"] }
+sha2               = "0.10"
 tracing            = "0.1"
 tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
 walkdir            = "2.5"