ARM64 support

[chejulien]

Hello everyone, I would like to know if SAPIEN supports ARM64 architecture, I have seen that it is x86_x64 on pip.
I've tried to build sapien, but it looks like there are a lot of dependent libraries that don't support arm64

[cixliv]

having the exact same issue

[fbxiang]

I will look into this. Since we recently successfully built SAPIEN with most core features on Arm-based MacOS, building on Arm Linux should not be harder.

[fbxiang]

I have added Arm64 into Github actions and we are able to compile the wheels (see latest nightly releases). I cannot make it manylinux compliant yet but it should work on Ubuntu >=20.04. You should be able to compile your own following the Github CI config.
The wheels are not tested yet. Please post the issues you met, or open a PR if you know a fix.