show which crates are imported

[nsheff]

one thing that's often confused me when using bulker is the importing of crates. for example, I don't know which crate actually contained the command I'm using, the one I'm loading, or one it imports.

One way to make this more transparent could be to have bulker inspect show which crates are imported by the current crate, and list commands by crate instead of all at once.