Add cxplat queued spinlocks

[Alan-Jowett]

This pull request introduces a new locking mechanism using spin locks and lock queue handles in the cxplat library. The changes include new function definitions, type declarations, and test cases to ensure the functionality is correctly implemented and tested.

New locking mechanism:

• Added new type definitions for cxplat_spin_lock_t and cxplat_lock_queue_handle_t in cxplat/inc/cxplat_processor.h to support the new locking mechanism.
• Implemented new functions for acquiring and releasing in-stack queued spin locks in cxplat/src/cxplat_winkernel/processor_winkernel.c. These functions wrap the corresponding kernel functions.
• Added similar functions for acquiring and releasing in-stack queued spin locks in cxplat/src/cxplat_winuser/processor_winuser.cpp, using SRW locks for user-mode implementation.

Testing:

• Added a new test case for the locking mechanism in cxplat/cxplat_test/cxplat_processor_test.cpp to validate the initialization, acquisition, and release of the spin lock.