[HAL] Extract profile event ring utility

Move the host-side lossy profile event ring mechanics shared by local profiling and AMDGPU queue/memory profiling into hal/utils/profile_event_ring. The helper owns only record positions, power-of-two wrapping, event id assignment, dropped-record accounting, snapshot spans, and commit-after-write bookkeeping; callers still own storage, synchronization, profile metadata, and sink sequencing.

Convert local profile rings and AMDGPU host-side queue/memory event streams to the utility. AMDGPU dispatch and queue-device profiling rings intentionally stay explicit because they are exact device-visible timelines tied to packet publication, reservation cancellation, completion-signal harvest, counters, and trace slots. Hiding those behind the lossy host-ring helper would blur the important queue contract instead of simplifying it.

The AMDGPU host-side event flush path now writes the same two-span snapshot style as local profiling instead of allocating and copying a temporary contiguous buffer. This keeps profiling-disabled paths unchanged while removing duplicate cold-path machinery.