SNode support on macOS

[sparse-mvs-2]

I'm currently trying to deploy taichi on macOS. Is there any chance that this issue can solve? Since Pointer SNode is not supported on macOS.
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sorry about that but advanced sparse features are only supported in CPU and CUDA backends (these backends are powered by the LLVM backend).

Originally posted by @PENGUINLIONG in #7534 (comment)
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[PENGUINLIONG]

Unfortunately there is no recent plan to support sparse features on Metal. Sorry about that :(

[damian0815]

Hi, I'd be interested in contributing code to make pointer SNodes work on Metal. i'm new to this codebase however - could someone give me a pointer to what needs to be done and where?