[issue34060] regrtest: log "CPU usage" on Windows

[Ammar Askar]

Ammar Askar <ammar at ammaraskar.com> added the comment:

> But then again, if it's solely for our tests, perhaps the best way to approach this is to start a Python thread that periodically runs this command?

This sounds like a very good solution to me, it avoids adding the complexity of the C code. We actually have two options here, to keep the results consistent with the unix load, we can use `typeperf "\System\Processor Queue Length"`

To get cpu usage, we can use the command Victor posted. I'll make an alternative PR with that today just so we can contrast the two approaches.

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