Optimize the gossip method by modifying peer states

In the VRF-based randomized leader election, the method `request_proposal_to_any` is awkward. If the tendermint module introduce a new peer state "priority", it can request proposals only to the nodes whose priorities are the highest.

Start at the `request_proposal_to_any` method and trace the VRF-based randomized leader-election flow into the Tendermint peer-state handling. Determine how a new `priority` state and highest-priority proposal requests should be specified, then document the expected behavior and tests needed to show that gossip targets only eligible high-priority nodes.

Written by the indexing model from the issue text.