Add metrics for virtual thread

[xiangtianyu]

Is your feature request related to a problem? Please describe.

I want to monitor the virtual thread and platform thread seperately

Describe the solution you'd like

We may add metrics for virtual thread or add label to seperate different kind of thread
Now we have JVM_THREAD_DAEMON and JVM_THREAD_STATE, is it possible to add a new label JVM_THREAD_TYPE or "is_virtual"?

Describe alternatives you've considered

No response

Additional context

No response

Tip

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[laurit]

Please do elaborate what exactly you are looking for, which metrics do you believe should have the is_virtual attribute, or are you looking for a completely new metric?

[xiangtianyu]

I want some metrics for virtual thread, such as the count of virtual thread, the metric "jvm.thread.count" is only for platform thread
https://github.com/open-telemetry/semantic-conventions/blob/4f638232672366897e483ebf13d22a21dc4c1364/docs/runtime/jvm-metrics.md?plain=1#L255