New device type: kDLCPUShared
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Description
Similar to `kDLCPUPinned`, CPU shared memory is allocated and managed quite differently from normal CPU memory. In DGL, we use shared memory to store large graphs so it is quite common to see operation to copy data between CPU memory and shared memory. I guess we could also use the extension type to handle that, but want to bring up this issue to see whether it is better to have a type for that in DLPack.
cc @zheng-da
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