RTEMS | Draft: Add POSIX mq priority bucket/bitmap path (!1165)

[Chandan U (@Chandanuvm)]

Chandan U created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1165

Project:Branches: Chandanuvm/rtems:chandan/posixmsgqinsert-bucket-bitmap to rtems/rtos/rtems:main
Author:   Chandan U



## Summary

Draft: Add POSIX mq priority bucket/bitmap path

Implement POSIX message queue priority buckets with bitmap
Keep legacy behavior as a fallback when optimization is unavailable.

Optimizes the performance from O(n) to O(1)


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