bark: add a debug-info command to surface helpful fields

lucarequested to merge
luca/eng-829-bark-add-debug-info-command into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

This aims at providing a useful command to run so it can surface the needed info to help a user during a support ticket.

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