Support for M1 / Apple silicon architecture

[pazzo83]

Julia has released a native version for M1 macs with its latest 1.7 beta (beta_3), so I just wanted to create an issue here regarding support for that architecture. There is a libsvm version for apple silicon (which you can install with homebrew: https://formulae.brew.sh/formula/libsvm), but I don't see anyway to have this package see that version.