added type hints to xglm pytorch

[mowafess]

What does this PR do?

I added type annotations for xglm (PT) as described in [https://github.com//issues/16059]

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Who can review?

@Rocketknight1 @patrickvonplaten @sgugger

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[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[Rocketknight1]

This looks great! I made a couple of small changes - we've had some issues with symbolic tracing unless we annotate Tuple as Tuple[torch.Tensor], but other than that this looks ready to go.