[C++ Frontend] Fix bug in torch::load and unpack torch::optim::detail namespace #15926
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Wasn't clearing optimizer buffers before adding new entries to it during deserialization. Successive calls to
torch::loadwith the same optimizer would just append to the buffer container. Also movedserialize()function fromtorch::optim::detailintotorch::optimso users can use it for custom optimizers.Fixes #15792
@ezyang