Proposal: Cargo Lint configuration

[nrc]

@JeanMertz

Just to clarify, you’re saying that the team is generally in favour of something like this (pending an RFC to nail down the exact details), and would accept this as a change to Cargo by anyone who is willing to put in the work, even if it’s not part of the 2019 roadmap, and the Cargo team won’t pick this up themselves. Ccorrect?

Yep, exactly that. There is a bit of an issue that if the PR is large, then finding review bandwidth might be a problem, but I think it would probably be OK.