bark: Output JSON when the config command is run

Peterrequested to merge
gh-8d0098b3/911/unknown/refs/pull/911/head into master

It felt a little redundant making a separate JSON struct for this because now we have three variations of the config. One is ConfigOpts for the command line parameters, one is the actual config we store and now the JSON version which mirrors the command line. I'm happy to change this if desired.

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