[XPTI] Replace std::shared_mutex with SharedSpinLock

[againull]

Replace std::shared_mutex with xpti::SharedSpinLock for short critical sections for better performance.

[Copilot]

Pull request overview

This PR replaces std::shared_mutex usage in the XPTI framework with xpti::SharedSpinLock (and xpti::SharedLock for reader locking) to reduce overhead for short critical sections.

Changes:

• Switch writer-side locking from std::unique_lock<std::shared_mutex> to std::lock_guard<xpti::SharedSpinLock> in tracepoint/payload and notification paths.
• Switch reader-side locking from std::shared_lock<std::shared_mutex> to xpti::SharedLock where applicable.
• Update member declarations and comments to reflect the new lock type.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
xptifw/src/xpti_trace_framework.cpp	Replaces shared-mutex locking in Tracepoints/Notifications with SharedSpinLock + SharedLock.
xptifw/include/xpti_string_table.hpp	Replaces StringTable shared-mutex locking with SharedSpinLock + SharedLock.

Comments suppressed due to low confidence (1)

xptifw/include/xpti_string_table.hpp:15

• After replacing std::shared_mutex with xpti::SharedSpinLock, this header no longer uses anything from <shared_mutex>. Dropping that include will reduce unnecessary dependencies for includers of this header.

#include "parallel_hashmap/phmap.h"
#include "spin_lock.hpp"
#include "xpti/xpti_data_types.h"
#include <hash_table7.hpp>

#include <atomic>
#include <shared_mutex>
#include <unordered_map>

[againull]

@cperkinsintel Could you please take a look.

[againull]

Failures unrelated:
MemorySanitizer/local/parallel_for_work_group.cpp - #21555
Adapters/level_zero/batch_test_copy_with_compute.cpp - #21548