[FEATURE] support Int4 qat in slime #1172
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1. add sglang new patch file 2. add new arg int4-params-rollout 3. add new request post_process_weights in both update_weight_from_distributed.py and update_weight_from_tensor.py
1. fix sgl-int4.patch bug
1. add SGLangEngine post_process_weights api
1. add convert_hf_to_hf_int4.py script to create int4 weight. 2. add README.md to tell how to use int4 3. add int4 train script
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support Int4 qat in slime, currently we do two things in this pr: