`fuel-sync` design

[xgreenx]

Rendered

I described the implementation, assuming that we can't change the block producer. Or we know the block producer at the height X because Ethereum blocks are synced, and we can get information about the producer.

The responsibility from whom and how requests the blocks on the P2P side. But it also is possible to move this responsibility into FS, but it requires corresponding modification of traits.

[Voxelot]

Redo to match the current state of sync without reputation. Add reputation in a follow-up.