[debug] show more advanced thread state

Currently the Debug view shows only quite basic thread state e.g running / suspended.

What I often encounter when I want to analyze some kind of blocking/slowness is that I need to suspend all threads and then look at the thread-dump and identify if the thread is currently in some kind of waiting mode or actually doing something useful.

One example is `EPoll.wait(int, long, int, int)` or `Unsafe.park(boolean, long)` and alike that usually indicate that the thread is NOT running but waiting for some events.

JProfiler has a nice "Thread History" view that shows Threads in different states here is one example:


Here are all supported states:

It would be great if JDT could also show these (as it seems to be supported somehow) maybe even using different icons so one gets a faster overview about what the Thread is currently doing.