RTEMS | Add TCB pointer to libdebugger's extra thread info (#5639)

[Chris Johns (@chris)]

Issue created by Chris Johns: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5639

Assignee: Chris Johns

## Summary

Print the TCB or `Thread_Control` pointer in the thread extra info query output. This is shown when you enter `info thread` at a GDB prompt.

The TCB is useful then inspecting objects that contain the TCB pointer. For example:

```
(gdb) p *__mutex
$4 = {
  _Queue = {
    _Lock = {
      _next_ticket = 7632,
      _now_serving = 7632
    },
    _heads = 0x7f49308,
    _owner = 0x7f44668,
    _name = 0x0
  }
}
(gdb) p __mutex->_Queue._owner
$5 = (_Thread_Control *) 0x7f44668
```

The `__mutex->_Queue._owner` field is the TCB and if the `info thread` command shows the TCB for a thread you can see which it is without the need to dump other thread specific details.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5639
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