pub fn query_workspace(&self, filter: impl FeatureFilter<'g>) -> FeatureQuery<'g> {
        self.package_graph
            .query_workspace()
            .to_feature_query(filter)
    }
Creates a new query over the entire workspace.

`query_workspace` will select all workspace packages (subject to the provided filter) and
their transitive dependencies.
guppy/src/graph/feature/query.rs