Add `APX` ISA extension #894

Job	Run time
Amalgamated build (Ubuntu 22.04)	7s
fuzzing (address)	1m 16s
CMake build + tests (macOS-latest )	19s
fuzzing (undefined)	1m 9s
MSBuild build (windows-2022)	1m 12s
CMake build + tests (macOS-latest -DZYAN_NO_LIBC=ON)	17s
fuzzing (memory)	1m 14s
CMake build + tests (windows-2022 )	1m 35s
CMake build + tests (windows-2022 -DZYAN_NO_LIBC=ON)	42s
CMake build + tests (ubuntu-22.04 )	10s
CMake build + tests (ubuntu-22.04 -DZYAN_NO_LIBC=ON)	6s
CMake build + tests (ubuntu-22.04 -DZYDIS_MINIMAL_MODE=ON -DZYDIS_FEATURE_ENCODER=OFF)	6s
CMake build + tests (windows-2022 -TClangCL)	2m 5s
	10m 18s

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