Rewrite cargo-metadata support, with review comments #132
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Two of them fail currently, the other doesn't but is still useful to validate the logic.
This should make cargo machete --with-metadata much more accurate. The previous version was able to get crate names (snake_case names usable in source files) from cargo metadata, but was unable to go back to the dependency spec written in Cargo.toml from that. As a result, --fix was broken. The mapping is complex because the published package can use a different name (see https://lib.rs/crates/md-5 for an example), the dependency spec can rename it again (through key = { package = … }), and keys with dashes are mapped to crate names with underscores. Two of these cases were broken, all of them now work. This also removes a hack that attempted to extract package names from cargo SourceIds. Those are opaque and have changed as recently as Rust 1.78 (Cargo.lock v4).
With [patch] sections, this may not be the case.
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This makes cargo machete --with-metadata --fix work; it previously broke
with kebab-case package names and packages like xml-rs.
It also removes a hack that attempted to parse opaque source ids (last updated in #106).
The solution involves looking at .packages and not just .resolved.
Same as #122, but with review comments addressed to help with landing.