[dlinfer]change llm op interface of paged_prefill_attention. #2977
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RunningLeon
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Motivation
This PR changes llm op interface of paged_prefiil_attention.
Modification
Add relevant params to dlinfer attention backend and kernel
Added params requested by tmo:
cu_seq_lens_kv (Tensor): The cumulative sequence lengths of the key/value sequences.
max_kv_seq_len (int): The maximum length of any key/value sequence.