update gossipsub

[turuslan]

• general
  • (compare with other versions, e.g. rust)
  • allow multiple protocol versions in config, remember peer protocol version
• /floodsub/1.0.0 (spec)
  • broadcast message to all floodsub peers
• /meshsub/1.0.0 (spec)
  • publish to fanout when not subscribed
• /meshsub/1.1.0 (spec)
  • (check PRUNE backoff works as expected)
  • explicit peers - always connect and broadcast without GRAFT
  • flood publishing - broadcast authored message to all connected peers
  • peer scoring
  • adaptive gossip dissemination - gossip to percentage of peers instead of count
  • opportunistic GRAFT to improve mesh median score
  • maintain specified number of outbound connections to avoid eclipse attack
• /meshsub/1.2.0 (spec)
  • IDONTWANT to prevent duplicate broadcast
    • broadcast IDONTWANT to mesh peers after receiving full message
    • don't broadcast these message to that peer after receiving IDONTWANT
  • IDONTWANT to cancel IWANT
    • send IDONTWANT to cancel pending IWANT after receiving full message
    • don't reply to IWANT for these messages for that peer after receiving IDONTWANT
  • config max IDONTWANT messages