[CE]add wint4 ep (#5355)

Author: tianlef

benchmarks/yaml/eb45-32k-wint4-ep4-tp4.yaml

@@ -0,0 +1,7 @@
+num_gpu_blocks_override: 1024
+max_model_len: 8192
+max_num_seqs: 64
+data_parallel_size: 4
+tensor_parallel_size: 1
+enable_expert_parallel: True
+quantization: wint4