Switch to NP from Jax to improve attention manager performance #184
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Current Jax implementation is slow. The operation array is tiny, leverage NP compute in CPU can boost the performance.
The performance improved >30x. Below are two benchmark comparison before vs after this PR:
Before
Total: 16 ms, fill_new_page: 3ms, get_page_token_indices: 13msAfter
Total: 0.5 ms, to_nparray: 0.1 ms, fill_new_page: 0.01ms, get_page_token_indices: 0.05 ms to_jax_array:0.3 ms