RTEMS | Add Classic API Barrier 'get number waiting' Service (!440)

[mazen Adel (@mez3n)]

mazen Adel created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/440

Project:Branches: mez3n/rtems:main to rtems/rtos/rtems:main
Author:   mazen Adel




## Summary

Add Classic API Barrier 'get number waiting' Service

Added rtems_get_number_waiting according to the issue rtems/programs/gsoc#9, including tests and documentation.


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