[IValue] Better handle sparseTensors in extractStorages (#100783)
Sparse tensors don't seem to be handled when we have tensors instead
of pyobjects.
Differential Revision: [D45632427](https://our.internmc.facebook.com/intern/diff/D45632427/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100783
Approved by: https://github.com/H-Huang
