Thanks @mbs-octoml!

`Target` is a compile-time concept, while `device` is a runtime concept. The 
separation design is to make sure that a target can describe a device that 
doesn't exist on the host, mainly for cross compilation.

And yes, in principle, every `TargetKind` corresponds to a `DLDeviceType`, for 
example
- llvm (compile time) => kDLCPU (runtime)
- cuda (compile time) => kDLCUDA (runtime)
- nvptx (compile time) => kDLCUDA (runtime)

Note that `device_id` is not present anywhere in the `Target` system, because 
we don't require the device to be present on the host in compile time.





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