Add `chainer_torch_function` and `TorchCainerFunction`#27

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emcastillo wants to merge 2 commits intochainer:masterfrom emcastillo:chainer-torch-function

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Commits on Jun 19, 2020

Added chainer_torch_functions to call torch functions inside chainer
Emilio Castillo
committed

Commits on Jul 22, 2020

Added the reverse, call from torch a chainer function
Emilio Castillo
committed