RTEMS | Add CPU Usage calls to return the time or ticks accounted for in tasks (#5060)

[Chris Johns (@chris)]

Chris Johns commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5060#note_108692


The man page on FreeBSD says:

> This interface is obsoleted by getrusage(2) and gettimeofday(2).

The issue with `getrusage()` is:

```c
  /*
   *  RTEMS only has a single process so there are no children.
   *  The single process has been running since the system
   *  was booted and since there is no distinction between system
   *  and user time, we will just report the uptime.
   */
```

And EPICS wants the amount of time tasks have used which is this time less `IDLE`. I am now wondering is `IDLE` time should be account for as system time and that would leave user time as the time spent running tasks?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5060#note_108692
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