Proposal: multi leader nodes in logical locations

[anjmao]

Hi, in my kilo fork I implemented such topology.

Each nodes inside private VPC subnet can communicate with each other node without encryption and sets direct routes to all nodes outside of it's VPC via WireGuard.

Benefits:

1. Traffic between private VPC nodes is not encrypted.
2. No additional hop and encapsulation needed, should work with all CNI plugins.

Drawbacks:

1. Each node must have public IP with opened port for WireGuard.
2. Each node must know other clouds nodes (still better than full mesh).

@squat What is your opinion on such topology? If it make sense I could create PR with my changes.