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The `[hints]` table in a `Cargo.toml` manifest provides optional information that Cargo can use for building the package, and will use even when using the package as a dependency. All hints can be safely ignored, and Cargo only warns about unknown hints, but does not error. This allows packages to use hints without depending on new Cargo. Add a `mostly-unused` hint, which allows a package to hint that most users of the package will not use most of its items. This is useful for improving the build performance of crates with large dependencies. Crates can override this hint using `hint-mostly-unused = false` in their profile for a dependency.