Cargo cache cleaning

Cargo has recently gained an unstable feature on the nightly channel (starting with nightly-2023-11-17) to perform automatic cleaning of cache content within Cargo's home directory. This post includes: A description of what this means (What is this feature?) A call for help (What to watch out for and Request for feedback) Implementation details (Design considerations and implementation details) An outline of what is planned for the future (Plan for the future) In short, we are asking people wh...