Add ability to specify pipelineable preproc modules to ignore during SDD model rewrite #2149
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Summary:
Make torchrec automatically pipeline any modules that don't have trainable params during sparse data dist pipelining.
tldr; with some traversal logic changes, TorchRec sparse data dist pipeline can support arbitrary input transformations at input dist stage as long as they are composed of either nn.Module calls or currently supported ops (mainly getattr and getitem)
Differential Revision: D57944338