[sparse] add sparsity, add wanda sparsifier to ao #22
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I decided to call the folder sparsity because all of the other constructs are called sparsity, it's only torch.ao.pruning (the namespace) that is called pruning, because zafar decided to migrate it. I'm not sure if it's worth the effort to move everything to be called pruning, and given almost everything is called sparsity it seems like the right choice. I do not feel strongly about this though and could be convinced otherwise