Tensor #[must_use] not always correct

[AlexanderEkdahl]

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Hi,

First off, thank you for this amazing library!

I noticed how Tensor has been annotated with #[must_use] but this isn't necessarily correct for in-place operations such as cumsum_.

Could the generating method be updated to only annotate #[must_use] for non-in-place operations? I'd be happy to implement this if you think it is a good idea?

[Butanium]

This is indeed annoying, I would love to see this fixed