Use a different str for device instead of meta #7995
Merged
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Implements this idea: #7705 but without the C++ piece.
We could use anything for the device (incl just a string: https://github.com/albanD/subclass_zoo/blob/main/new_device.py); however it's advantagous to use a torch.device with an existing registered key. (we could use 'xla:0' too).
The caveat is that we need to capture tensor constructors in jtorch instead of jaten (like it used to be) because otherwise torch will check if such device module is loaded or not (example for capturing 'cuda').
fixes #7966