[epic]: Gossip 1.75

[ellemouton]

This issue will be used to track the progress of spec proposal and LND implementation of Gossip 1.75.

Useful Links

• Draft spec proposal: https://github.com/lightning/bolts/pull/1059

PRs

• [x] https://github.com/lightningnetwork/lnd/pull/8117
• [ ] https://github.com/lightningnetwork/lnd/pull/8044
• [ ] https://github.com/lightningnetwork/lnd/pull/8164
• [ ] #8252
• [ ] #8253
• [ ] #8254
• [ ] #8255
• [ ] #8256

Draft impl:

If you want to get a view of what the big picture changes look like, check out: https://github.com/lightningnetwork/lnd/pull/8185

Plan

• [x] Spend some time understanding how LND handles Gossip today
• [x] Update the spec proposal with the latest updates
• [ ] Flesh out: Handling of old & new gossip messages (ie, when does it make sense to stop sending old node announcement etc)
• [x] add new lnwire messages
• [ ] Flesh out: nonce generation for announcement_sigs_2
• [x] Flesh out gossip query updates
• [x] Code for handling new received channel_announcement_2
• [x] Code for handling new received channel_update_2
• [ ] Code for handling new received node_announcement_2
• [ ] Code for creating new node_announcement_2
• [x] Code for creating new channel_announcement_2 in the funding manager
• [x] Code for creating new channel_update
• [x] Update code for handling gossip queries