Add info contributor support for JDK 24's VirtualThreadSchedulerMXBean

[panic08]

In this commit, for applications using Spring with JDK 24, I added support for viewing Virtual threads information in ProcessInfo using VirtualThreadSchedulerMXBean. The use of VirtualThreadSchedulerMXBean is done using reflection. If the current JDK version is less than 24, then we will return null, otherwise a class with all the required VirtualThreadsInfo information.

I also added a test checking if null is returned if the JDK version is less than 24.

There is also a point that bothers me, do you think we need an additional test to check the values of the VirtualThreadsInfo fields themselves or not?

Related to #43175

[philwebb]

Thanks very much for the PR. I've added some review comments for your consideration.

[philwebb]

do you think we need an additional test to check the values of the VirtualThreadsInfo fields themselves or not?

I think we could add something to the existing test just to check that we have sensible(ish) values.

[mhalbritter]

Thank you very much and congratulations on your first contribution 🎉!

[nosan]

Since reflection is being used here, I wonder whether RuntimeHints should be registered for jdk.management.VirtualThreadSchedulerMXBean.

	static class ProcessInfoContributorRuntimeHints implements RuntimeHintsRegistrar {

   	private final BindingReflectionHintsRegistrar bindingRegistrar = new BindingReflectionHintsRegistrar();

   	@Override
   	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
   		this.bindingRegistrar.registerReflectionHints(hints.reflection(), ProcessInfo.class);
   		hints.reflection()
   			.registerTypeIfPresent(classLoader, "jdk.management.VirtualThreadSchedulerMXBean",
   					MemberCategory.INVOKE_PUBLIC_METHODS);
   	}

   }

[mhalbritter]

Yeah, good catch. I'll add that.