[TASK] Track network topology and use to optimize signing set selection

[drewstone]

Overview

If we can track the network topology and easily identify who is connected to who, then possibly we can use this information to understand how to more intelligently select signing sets. For example, we can select signing sets based on the direct connections to peers conditioned on their reputation.

More explicitly, if understanding the network topology is deterministic and everyone has the same view at a certain finalized block, then we can select and rank all strongly connected sets by aggregate reputation and select sets that way.

Task

• Investigate how polkadot tracks network topology and other available methods in Substrate.
• Implement in DKG.
• Test with test harness.