refactor: decouple kv-cache storage #379
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In our previous design, k-cache and v-cache are coupled together as a
(num_pages, 2, page_size, num_heads, head_dim)or a(num_pages, 2, num_heads, page_size, head_dim)tensor.In this PR, we decouple the k-cache and v-cache storage to enable more flexible kv-cache storage. Note that the original coupled layout is still supported, but we also supports standalone k-cache and k-cache.