Improves the output of "yarn config"

[arcanis]

What's the problem this PR addresses?

It's a little difficult to ask people to check specific values of their configuration at the moment. They need to run yarn config get <name> to see the value, or yarn config --why | grep <name>, but that isn't very visible.

How did you fix it?

It's a bit of an experiment to try to change the output from:

To the new tree display:

To offset the lack of compaction, the command now also accepts a list of setting names on the command line, so you can write the following:

yarn config nodeLinker

Or even multiple parameters:

yarn config supportedArchitectures enableGlobalCache

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.