DirectML Support

[luisquintanilla]

Moving this issue from dotnet/machinelearning#6492 since the work required would need to happen in TorchSharp.

[NiklasGustafsson]

Yeah, well... once libtorch supports DML, for which there are no active plans, we can revisit this. Closing now.

[engineer1109]

Still not support now.

[NiklasGustafsson]

Yes, still waiting for libtorch to support DirectML