Gossipsub: Add peer to mesh on subscribe
In the rust implementation, when a peer subscribes to a topic, it adds the newly subscribed peer to the topic mesh if needed. Note that this is not done in the go implementation.
Edited by Lin Oshitani
In the rust implementation, when a peer subscribes to a topic, it adds the newly subscribed peer to the topic mesh if needed. Note that this is not done in the go implementation.