Enhance the GitHub Actions CI workflow by introducing a comprehensive test job that runs a new script (`run_all_tests.sh`) for building, testing, and benchmarking. Update dependencies to use the latest actions and ensure consistent environment variables. Remove the previous build-and-test and benchmark jobs, consolidating functionality for improved clarity and efficiency.
- 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
In our GitHub Actions CI, update the Code Coverage step for the `libmarlin` crate to invoke Tarpaulin using the nightly toolchain. This ensures we pick up the latest coverage features and avoid the unexpected argument error:
* Replace the two-line `cargo tarpaulin` invocation with a single command using `cargo +nightly tarpaulin --package libmarlin --out Xml --fail-under 85`.
* Removes the extraneous line break and aligns with the rest of our Rust commands under nightly when needed.
