bark: make barkd sync intervals configurable

lucarequested to merge
config-barkd-sync 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/)

While I was working on the barkd test framework, I faced an issue on the sync intervals being too long for regrets and testing scenarios. Thus I wanted to make the sync interval configurable.

Edited by luca

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