Provide function to extract the value from a dual tensor #208
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See the updated docstring for example and motivation, and this example, where the internal
_extract_valueis used, is a "real-world" use case.Tensor.extract_valueis defined (exclusively forAbstractTensorinput) and documented in this PR. For scalarsForwardDiff.valueshould be used.Due to the relatively generic name and fairly advanced (and not very frequent) use case, I think it is better to not export it, making it very clear that it is exclusively for tensors.