[Feature]: Support Box64 for x86_64 architecture emulation (and potentially box86 for 32bit)

[ikcikoR]

Feature description

Box64 allows running x86_64 binaries on aarch64 systems and it's way faster than qemu. I'm not sure how difficult it would be to add support for it into proot-distro nor if it can be done on proot-distro level at all to be honest, but it'd be a great feature if it worked out. With the little knowledge I have, seeing that you can already choose between blink and qemu gives me a bit of hope that this is relatively doable? box86 also exists and could potentially be handy, but x86_64 is the biggest deal for obvious reasons.

[TomJo2000]

This isn't really a problem for proot-distro to solve. Either:

• A.) You can install Box64/Box86 inside whatever distribution you are using via proot-distro ^{Though I'm not sure if, or how well, that would work}
• B.) Or we package them on Termux in which case that still wouldn't allow you to just take an arbitrary rootfs and run it on proot-distro through Box64.

#### From a packaging standpoint; Box86 was previously packaged - See: termux/termux-packages#7672 and subsequently disabled for relying heavily on Glibc internals (https://github.com/termux/termux-packages/commit/514cc2aa729f6e33c2d674eeba5c7abbf545bf82) Box64 has not been packaged so far. But has an official Termux build target in its upstream CMake file. - https://github.com/ptitSeb/box64/blob/87493a9bc9eff995680406cb56b792c4c045de95/CMakeLists.txt#L43-L45 So would presumably be fairly easy to package.