Include IndexResidual in clone_index
Include IndexResidual in clone_index

Summary:
Moving index from cpu to gpu is failing with error message `RuntimeError: Error in virtual faiss::Index *faiss::Cloner::clone_Index(const faiss::Index *) at faiss/clone_index.cpp:144: clone not supported for this type of Index`
This diff support IndexResidual clone and unblocks gpu training

Reviewed By: sc268, mdouze

Differential Revision: D28614996

fbshipit-source-id: 9b1e5e7c5dd5da6d55f02594b062691565a86f49

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