Since Notices still follow the VOEvent protocol there were no real changes to make to how Events are handled, aside from a small update to how LVK group parameters. There may be more work needed if/when NASA notices moves to a new unified schema (https://gcn.nasa.gov/docs/roadmap).
This PR adds the ability for the sentinel to receive GCN notices via Kafka (https://gcn.nasa.gov/) over the old "GCN Classic" serial method (https://gcn.gsfc.nasa.gov/).
Since Notices still follow the VOEvent protocol there were no real changes to make to how Events are handled, aside from a small update to how LVK group parameters. There may be more work needed if/when NASA notices moves to a new unified schema (https://gcn.nasa.gov/docs/roadmap).
Closes #65