Add `APX` ISA extension #995

Job	Run time
Amalgamated build (Ubuntu 22.04)	5s
CMake build + tests (macos-latest )	12s
fuzzing (address)	1m 26s
CMake build + tests (macos-latest -DZYAN_NO_LIBC=ON)	12s
Meson build + tests (macos-latest, debug default)	20s
fuzzing (undefined)	1m 17s
CMake build + tests (windows-2022 )	1m 25s
MSBuild build (windows-2022)	39s
Meson build + tests (windows-2022, debug default)	2m 12s
fuzzing (memory)	1m 30s
CMake build + tests (windows-2022 -DZYAN_NO_LIBC=ON)	1m 4s
Meson build + tests (ubuntu-22.04, debug default)	18s
CMake build + tests (ubuntu-22.04 )	6s
Meson build + tests (windows-2022, debug NO_LIBC)	1m 33s
CMake build + tests (ubuntu-22.04 -DZYAN_NO_LIBC=ON)	9s
Meson build + tests (ubuntu-22.04, debug NO_LIBC)	8s
CMake build + tests (ubuntu-22.04 -DZYDIS_MINIMAL_MODE=ON -DZYDIS_FEATURE_ENCODER=OFF)	8s
Meson build + tests (macos-latest, release default)	23s
CMake build + tests (windows-2022 -TClangCL)	2m 43s
Meson build + tests (windows-2022, release default)	1m 10s
Meson build + tests (ubuntu-22.04, release default)	22s
Meson build + tests (windows-2022, release NO_LIBC)	1m 23s
Meson build + tests (ubuntu-22.04, release NO_LIBC)	24s
Meson build + tests (ubuntu-22.04, minsize )	25s
	19m 34s

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