feat(sync-v2): Watchdog to detect stale syncing#857
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Motivation
Sync-v2 might get stale if an unhandled exception occurs. Even though we want to learn about the issue to get it fixed, we also want the full node to recover from issues. So, this PR introduces a watchdog that closes the connection if the sync gets stale. The full node will automatically reconnect and try to sync again.
Acceptance Criteria
Checklist
master, confirm this code is production-ready and can be included in future releases as soon as it gets merged