feat: support sync-v2 peers on node status

[jansegre]

Acceptance Criteria

• Addresses Implement support for sync-v2 when parsing node status #291
• Make latest_timestamp and sync_timestamp optional
• Add BlockInfo class and peer_best_block and synced_block fields with that class
• Add protocol_version field and use that to choose which pair of fields to parse (the other pair will be None)
• Update fixtures using examples from the latest deploy
• Adjust tests accordingly

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.