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Add Improver to find out Ghost packages
We have some packages coming from security advisories that doesn't exist anywhere, we should have an improver to verify if a package actually exists.
Would this be an improver per data source or a generic improver covering all data sources? Take for example #915, it could be an improver looking at (historical) package information from Alpine and specifically for Alpine.
Just add an example of typosquatting attack advisory from rust:
https://github.com/rustsec/advisory-db/blob/main/crates/rustdecimal/RUSTSEC-2022-0042.md
What should be done for this kind of advisory that doesn't have related package/version? Just ignore them?