control/controlknobs,feature/*,ipn/ipnlocal,tailcfg: add runtimemetrics

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Emit runtime metrics as clientmetrics when the
NodeAttrEmitRuntimeMetrics NodeCapability is present.

We start small with just 2 metrics: heap bytes and total process memory.

Updates tailscale/corp#39434

Signed-off-by: Jordan Whited <jordan@tailscale.com>

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