Add an audit_node_deps setup.py command.
Review Request #10998 — Created April 10, 2020 and submitted
audit_node_depscommand will audit the node.js build-time
dependencies for Djblets, checking if there are security issues for any
of them. This will ease the long-term management of our node.js
This change does not update any dependencies. That will be handled in an
Ran the new command and saw the audit report for our dependencies.