Feature/all-close

[FL33TW00D]

No description provided.

[LaurentMazare]

What is your use case for this? I'm a bit reluctant to adding too much helper functions in the main crate, especially as methods, it makes the tensor objects harder to use as there are plenty of methods available, and also it adds some complexity that might be deferred to other crates.
(also typically we would name this all_close and not allclose, the behavior on nan would have to be documented and checked, there would be no need for testing it on anything else than cpu as it doesn't define device specific basic ops)

[FL33TW00D]

@LaurentMazare I'm working on #1414 currently, and this would be handy to compare against known ground truths.

Will fix the remaining issues.

[LaurentMazare]

Ah great that you're looking at #1414, would certainly be good to iron out these whisper discrepancies.