feat: support speculative decoding. #31
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Support speculative decoding with only v5.2 and cuda.
Though I tested the example and it could run well, there's only 1.5B v5.2 model yet. Therefore we need to further test it after having other scale models. However the modifications doesn't break the current functionalities of cuda (not sure of ncnn). I'd like to suggest to review it rather than wait for the model release.
TODO: