Improve sync/gossip

[lrettig]

Right now it's harder to sync than we'd like. Sync sometimes gets stuck in spite of a node having many peers (e.g., spacemeshos/go-spacemesh#5127) and the only way to get it unstuck is to restart the node and thus refresh the peer set entirely. Sync is also slower than we'd like.

This is a meta-issue to track user-facing sync issues and pending improvements. Upcoming go-spacemesh release v1.2.2 should address many of these issues.

• sync: limit resources spent on serving data to peers go-spacemesh#4603
• p2p: gossip traffic prioritization go-spacemesh#3459
• Many ips /ports from the same node-id - situation observed on boosters go-spacemesh#4958
• decentralize p2p network #275
• sync v2 #272

See also: https://github.com/search?q=org%3Aspacemeshos+label%3Aarea%2Fsync&type=issues