feat: implement process.cpuUsage (Deno.cpuUsage)

[CyanChanges]

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[Hajime-san]

Does it need to check --allow-sys permission?

[CyanChanges]

Does it need to check --allow-sys permission?

memoryUsage doesn't check --allow-sys, so i guess no?
Also process.cpuUsage() process.memoryUsage() are both for current process.

[CyanChanges]

Do I need to change something after adding an op? After add the op_runtime_cpu_usage, some tests fails

[irbull]

The operations are listed in 2 different arrays, and they must have the same order:

See
https://github.com/CyanChanges/deno/blob/main/runtime/ops/os/mod.rs#L45
https://github.com/CyanChanges/deno/blob/main/runtime/ops/os/mod.rs#L15

Look at the last 2 elements of both lists.

[CyanChanges]

@irbull can you please review again?

[irbull]

@irbull can you please review again?

I'm not on the core team so I can't actually review this, but I'll look at this again tomorrow and leave my thoughts, and I can ask on Discord for someone on the team to take a final look.