Add `APX` ISA extension #1027

Job	Run time
Amalgamated build (Ubuntu 22.04)	6s
Meson build + tests (macos-latest, debug default)	18s
fuzzing (address)	10m 34s
CMake build + tests (macos-latest )	17s
Meson build + tests (windows-2022, debug default)	1m 33s
fuzzing (undefined)	8m 47s
MSBuild build (windows-2022)	1m 16s
Meson build + tests (ubuntu-22.04, debug default)	10s
CMake build + tests (macos-latest -DZYAN_NO_LIBC=ON)	11s
fuzzing (memory)	11m 30s
Meson build + tests (windows-2022, debug NO_LIBC)	1m 42s
CMake build + tests (windows-2022 )	1m 14s
Meson build + tests (ubuntu-22.04, debug NO_LIBC)	13s
CMake build + tests (windows-2022 -DZYAN_NO_LIBC=ON)	1m 7s
Meson build + tests (macos-latest, release default)	26s
CMake build + tests (ubuntu-22.04 )	8s
Meson build + tests (windows-2022, release default)	2m 10s
CMake build + tests (ubuntu-22.04 -DZYAN_NO_LIBC=ON)	15s
Meson build + tests (ubuntu-22.04, release default)	23s
CMake build + tests (ubuntu-22.04 -DZYDIS_MINIMAL_MODE=ON -DZYDIS_FEATURE_ENCODER=OFF)	7s
Meson build + tests (windows-2022, release NO_LIBC)	1m 52s
CMake build + tests (windows-2022 -TClangCL)	1m 40s
Meson build + tests (ubuntu-22.04, release NO_LIBC)	31s
Meson build + tests (ubuntu-22.04, minsize )	27s
	46m 57s

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