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_108693


In an SMP system would the `IDLE` time reported as system time be the total of active periods for all the `iDLE` threads? I think it is.

For example if you have 4 CPUs and 2 are running at 100% and 2 are idle the over all load is 50%, ie `user / (user + system)` if user is the total time tasks have run for and system is the total idle time.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5060#note_108693
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