DAL/Gossipsub: need a mechanism to track topics on top of gossipsub
In the DAL node, the producer must track the committee. An API on top of the gossipsub worker to automatically compute the symmetric difference between the currently tracked topics and a given set of topics would be useful. The semantics would be to automatically send the minimal amount of messages to update the mesh to gossipsub, while potentially executing callbacks registered on the events corresponding to a topic being added or removed.