[infer]Add and optimize vllm Continous Batching and Pageattention

[isky-cd]

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The code coverage for the changed files is 33%.

Click me to view the complete report

Name                                             Stmts   Miss  Cover
--------------------------------------------------------------------
colossalai/inference/tensor_parallel/engine.py     203    165    19%
colossalai/inference/tensor_parallel/utils.py       36     26    28%
tests/test_infer/test_bloom_infer.py                43     16    63%
tests/test_infer/test_infer_engine.py               64     35    45%
tests/test_infer/test_llama_infer.py                63     33    48%
--------------------------------------------------------------------
TOTAL                                              409    275    33%