[feature] vllm-ascend support msprobe (eager mode dump) (#4241)

### What this PR does / why we need it?
vllm-ascend need to dump data during model execution to debug some
precision problems, here msprobe provide the corresponding abilities, so
msprobe will join vllm-ascend to make debug easier

### Does this PR introduce _any_ user-facing change?
```
'dump_config': '/path/to/config.json'
```



- vLLM version: v0.11.0
- vLLM main:
2918c1b49c

---------

Signed-off-by: Tjh-UKN <2559659915@qq.com>

vllm_ascend/ascend_config.py

@@ -44,6 +44,10 @@ class AscendConfig:
         self.ascend_scheduler_config = AscendSchedulerConfig(
             ascend_scheduler_config)
 
+        # Dump / PrecisionDebugger configuration
+        dump_config_path = additional_config.get("dump_config", None)
+        self.dump_config = DumpConfig(dump_config_path)
+
         weight_prefetch_config = additional_config.get(
             "weight_prefetch_config", {})
         self.weight_prefetch_config = WeightPrefetchConfig(
@@ -230,6 +234,18 @@ class AscendSchedulerConfig:
                 setattr(self, k, v)
 
 
+class DumpConfig:
+    """
+    Configuration object for dump/PrecisionDebugger settings.
+    """
+
+    def __init__(self, dump_config_path: Optional[str] = None):
+        # enable_dump is True when dump_cfg exists and config_path is not empty
+        self.enable_dump: bool = bool(dump_config_path)
+        # Path to msprobe config json; may be None.
+        self.config_path: Optional[str] = dump_config_path
+
+
 class WeightPrefetchConfig:
     """
     Configuration Object for weight_prefetch_config from additional_config