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feat(toml): Add `autolib` ### What does this PR try to resolve? PR #5335 added `autobins`, etc for #5330. Nowhere in there is discussion of `autolib`. Cargo script disables support for additional build-targets by disabling discovery. Except we don't have a way to disable discovery of `autolib`, leading to #14476. By adding `autolib`, we can continue in that direction. This also allows us to bypass inferring of libs on published packages, like all other build-targets which were handled in #13849. Fixes #14476 ### How should we test and review this PR? ### Additional information As this seems fairly low controversy, this insta-stabilizes the field. In prior versions of Cargo, users will get an "unused manifest key" warning. For packages where this is set by `cargo publish`, the warning will be suppressed and things will work as normal. For `cargo vendor`, the same except there will be some churn in the vendored source as this field will now be set. For local development, it should be rare to set `autolib` so the lack of error by discovering a file when this is set shouldn't be a problem.