#54 add api deps command

Mention that these are *resolved* dependencies, not raw dependencies. srclib deals with both and it is good to be explicit about which kind we're dealing with here.

And it also includes failed dep resolutions, so maybe say:

* list all resolved and unresolved dependencies for a commit hash and package name
* Return a list of all resolved and unresolved dependencies that are in the current repository.

(Also, I changed "current file" to "current repository".)