Allow to find out easy way what feature was enabled in transient in crate and what not

[dzmitry-lahoda]

I usually do

1. Look into Cargo.lock

cargo check --verbose --job 1 --unit-graph -Z unstable-options 

3. cargo tree

I have the case

1. A has std feature.
2. It uses B having std, sure when A has std.
3. B uses C. C has std too. But be forgot to enable std on C.
4. So when I compile A, it fails, because we are in std feature, but C did not enabled it.

In some codebase it hard to debug - when there are dozens of crates in several layers with several adhoc features (I work at such). I use above tooling.

Would be awesome to have some oneliner to see all features in crates, why they are enabled or not.