Add a way to audit the licenses of all of packages you depend on

[DougGregor]

Description

It would be nice to have a way to retrieve the licenses for all of the packages that a given package depends on, to help automate an audit of licenses for compatibility. Something like

swift package licenses

Expected behavior

This command could produce a listing of each package dependency (recursively) and the license they hold (if it's recognized), with a link to each license file to make it easy to walk through them. Perhaps sort by license so it's easy to skip past known-good licenses.

Actual behavior

No response

Steps to reproduce

No response

Swift Package Manager version/commit hash

No response

Swift & OS version (output of swift --version && uname -a)

No response