rustreleaseartefact: Extract and install Rust release artefacts

Repository: https://gitlab.com/Screwtapello/rust_release_artefact

Documentation: https://docs.rs/rust_release_artefact

TODO

• Update ExtractedArtefact::new() to use walkdir to search for artefact marker files.
• Would it be neater to toss the first path-component of archives, rather than extracting it and having to rummage around to find the artefact metadata?