kubectl: support Go runtime execution tracing

[nsrip-dd]

What would you like to be added?

Support for running kubectl with the Go runtime execution tracer enabled.

Why is this needed?

There is already support for enabling most of the runtime profilers via the --profile option, but not for the runtime execution tracer. The tracer is useful for finding concurrency bottlenecks and understanding off-CPU time, including networking, in a way that isn't possible with any of the other Go profilers. Having it would make it easier to debug latency issues in kubectl.

I'm happy to send a PR implementing this.

[k8s-ci-robot]

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[nsrip-dd]

/sig cli

[HirazawaUi]

/transfer kubectl

[mpuckett159]

/triage accepted
This sounds like a good idea, we would be happy to accept a PR to enable this.