That crate could involve some automation like:
* Checking that the code in the crate matches the code in Github
* Checking whether the latest commit is from a new committer, or whether there is any code comitted by a user not in a whitelist,
* Checking whether the package has any known security advisories
* Checking that crate signatures match some whitelist
* Running a project that includes the crate in a sandbox and seeing whether there are any files accessed, network accesses, etc. that were not pre-whitelisted
New versions of included crates would have to go through this battery of checks before they get bumped in the super-crate.
Crates that want to be included as features of super-crate or that need to change/add significant functionality, or add dependencies, would need to make a PR to update the relevant whitelists, which could then be reviewed by the super-crate team