Add support for new JMX method HotSpotDiagnosticMXBean.dumpThreads()

[thurka]

A new JMX method com.sun.management.HotSpotDiagnosticsMXBean.dumpThreads() was added as part of JEP 444: Virtual Threads. This method generates the new-style thread dump and can be used to visualize the thread dump with a large number of virtual threads.