Add sparsity warmup #32
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Add sparsity warmup to Gated, JumpReLU, and Standard Trainers. I implemented this as it was simple and GDM / Anthropic use it for all SAEs as far as I can tell. I left P Anneal variants alone as it could mess with the p annealing schedule. From testing, this seems to make a relatively minor difference and slightly increases the number of alive features.