RTEMS | cpukit/libcsupport: Implement malloc_usable_size (!591)

[Jeremy Lorelli (@jjl77)]

Jeremy Lorelli created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/591

Project:Branches: jjl77/rtems:pr-malloc_usable_size to rtems/rtos/rtems:main
Author:   Jeremy Lorelli




## Summary

cpukit/libcsupport: Implement malloc_usable_size

Implement malloc_usable_size to get the underlying heap block size of a
memory address on the heap.

Closes #4503


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/591
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