Add `APX` ISA extension #991

Job	Run time
MSBuild build (windows-2022)	57s
Meson build + tests (macos-latest, debug default)	19s
Meson build + tests (windows-2022, debug default)	2m 15s
Amalgamated build (Ubuntu 22.04)	6s
Meson build + tests (ubuntu-22.04, debug default)	35s
CMake build + tests (macos-latest )	14s
Meson build + tests (windows-2022, debug NO_LIBC)	1m 46s
CMake build + tests (macos-latest -DZYAN_NO_LIBC=ON)	10s
Meson build + tests (ubuntu-22.04, debug NO_LIBC)	10s
fuzzing (address)	1m 27s
CMake build + tests (windows-2022 )	1m 21s
Meson build + tests (macos-latest, release default)	24s
fuzzing (undefined)	1m 20s
CMake build + tests (windows-2022 -DZYAN_NO_LIBC=ON)	1m 7s
Meson build + tests (windows-2022, release default)	2m 16s
fuzzing (memory)	1m 25s
CMake build + tests (ubuntu-22.04 )	9s
Meson build + tests (ubuntu-22.04, release default)	31s
CMake build + tests (ubuntu-22.04 -DZYAN_NO_LIBC=ON)	16s
Meson build + tests (windows-2022, release NO_LIBC)	1m 52s
CMake build + tests (ubuntu-22.04 -DZYDIS_MINIMAL_MODE=ON -DZYDIS_FEATURE_ENCODER=OFF)	13s
Meson build + tests (ubuntu-22.04, release NO_LIBC)	20s
CMake build + tests (windows-2022 -TClangCL)	2m 11s
Meson build + tests (ubuntu-22.04, minsize )	22s
	21m 46s

Provide feedback