debug_image_info_table: rework atomics and add tests. #1188
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Description
This change switches the METADATA global static to use RwLock instead of AtomicPtr and adds some comments and tests to the module.
Closes #1187
How This Was Tested
Confirmed Patina debugger operation on x86_64 QEMU. Confirmed that
!monitor system_table_ptrand!monitor mod listwork as expected.Integration Instructions
N/A