KubeSpan segmentation

[smira]

Problem

KubeSpan allows to expand cluster across different regions, it allows to combine bare-metal and cloud machines in a single Talos Linux cluster in a transparent way.

KubeSpan creates a mesh Wireguard network, which means that each Talos machine establishes a tunnel to each other machine. For a cluster with N machines this means each machine has N-1 tunnels, so overall N*(N-1)/2 tunnels for a cluster. For a cluster of small size this isn’t a problem, and provides simple zero configuration solution, while for cluster with hundreds of machines this number is unreasonably high.

Summary

Split the Talos Linux cluster into segments, within each segment machines can talk to each other using native routing, while across the segments elected router machines will transport the traffic to other segments.

Tasks

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1. Segment Support #8365
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2. KubeSpan segmented operation #8366
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