Add torch.accelerator API to minGPT-ddp example

[gera-aldama]

Refactor minGPT-ddp example to utilize torch.accelerator and torch.amp. With these APIs, the code can abstract away specific details related to hardware accelerators, making it more flexible and adaptable to different environments.

CC: @msaroufim @malfet @dvrogozh

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[soumith]

thanks!