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

Cargo.toml

@@ -1,4 +1,5 @@
 [workspace]
+resolver = "2"
 members = [
     "libmarlin",
     "cli-bin",