[Unity][SWA] Overriding windowed cache support #15963
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Part of the effort on Sliding Window Attention (SWA) mlc-ai/mlc-llm#1003. Overriding the cache is useful when computing SWA, so we can have a more efficient cache only containing the current window keys and values. Once the cache is full we start overriding the older entries.
cc @tqchen