Proposal: No-tag back Gossiping

A proposal from @antoine and Dean Eigenmann

"Learn about the mechanisms suggested by NTB-G to improve the reliability of gossip protocols, including ideas like “peer trails” and “max hops”

Spec https://hackmd.io/owviUNfeRkmSlgtJQcaQFg?view

Longer form exploration of ideas: https://medium.com/whiteblock/no-tag-back-gossiping-c8b99906e891