[main][Feature] Support Qwen3 W4A8 quantization (#2060)

### What this PR does / why we need it?

Adding `W4A8_DYNAMIC` quantization support for linear.
Dense models like Qwen3 can infer with `W4A8_DYNAMIC` quantization.

### Does this PR introduce _any_ user-facing change?

None

### How was this patch tested?

Adding ut case in `tests/ut/quantization/test_w4a8_dynamic.py`
Adding e2e case in
`tests/e2e/multicard/test_offline_inference_distributed.py::test_models_distributed_Qwen3_W4A8DYNAMIC`
to test qwen3 w4a8_dynamic quantized model

Note the w4a8_dynamic quantized model is quantized by `msit/msmodelslim`
of commit `d0abb0a47e1f1a473b866ad41b737fbc28fb1409`

1. Generate `W4A8_DYNAMIC` quantization weights using `msmodelslim`
```shell
git clone https://gitee.com/ascend/msit.git
cd msit/msmodelslim
git checkout d0abb0a47e1f1a473b866ad41b737fbc28fb1409
bash install.sh
```

2. Serve model using `vllm`
```shell
VLLM_USE_V1=1 python -m vllm.entrypoints.openai.api_server \
  --model vllm-ascend/Qwen3-8B-W4A8 \
  --port 8000 \
  --quantization ascend \
  --tensor_parallel_size 2 \
  --enforce-eager
```

- vLLM version: v0.10.0
- vLLM main:
4cd7fe6cea

---------

Signed-off-by: ZhouXiang <zhouxiang100@huawei.com>

vllm_ascend/quantization/quantizer.py

@@ -23,6 +23,7 @@ from typing import Any, Dict, List, Optional
 from vllm.logger import logger
 
 from .func_wrapper import wrapper_rmsnorm_forward_oot, wrapper_rmsnorm_init
+from .w4a8_dynamic import AscendW4A8DynamicLinearMethod
 from .w8a8 import (AscendC8KVCacheMethod, AscendW8A8FusedMoEMethod,
                    AscendW8A8LinearMethod)
 from .w8a8_dynamic import (AscendW8A8DynamicFusedMoEMethod,
@@ -263,6 +264,13 @@ class VLLMAscendQuantizer:
                                   f"{list(SUPPORT_ASCEND_QUANTIZER_TYPE.keys())}")
 
 
+class W4A8DYNAMICQuantizer(VLLMAscendQuantizer):
+
+    @staticmethod
+    def build_linear_method():
+        return AscendW4A8DynamicLinearMethod()
+
+
 class W8A8Quantizer(VLLMAscendQuantizer):
 
     @staticmethod
@@ -290,6 +298,7 @@ class W8A8DYNAMICQuantizer(VLLMAscendQuantizer):
 
 
 SUPPORT_ASCEND_QUANTIZER_TYPE = {
+    "W4A8_DYNAMIC": W4A8DYNAMICQuantizer,
     "W8A8": W8A8Quantizer,
     "W8A8_DYNAMIC": W8A8DYNAMICQuantizer,
     "C8": W8A8Quantizer,