Take default-features into account

[ggwpez]

Needed for paritytech/polkadot-sdk#1194

Changes to lint propagate-features:

• If a crate A depends on a crate B and enables its default features, then now all features of B that are transitively enabled by its default feature will also count as being enabled. Note that it only considers features that B enables on itself. It could also check for transitive dependencies in the form of B/G -> C/F -> B/F but it will only allow paths that consist solely of B/* to keep things simple.