[core]vllm-ascend support msMonitor tool (#3123)

### What this PR does / why we need it?
vllm-ascend support [msMonitor
](https://gitcode.com/Ascend/mstt/tree/master/msmonitor)tool to collect
performance of vllm-ascend

### Does this PR introduce _any_ user-facing change?
1.add env MSMONITOR_USE_DAEMON；
2.user cann enable msMonitor tool by setting MSMONITOR_USE_DAEMON=1
before run vllm-ascend model；
3.MSMONITOR_USE_DAEMON and VLLM_TORCH_PROFILER_DIR cannot both set

### How was this patch tested?
1.run vllm-ascend model while not set MSMONITOR_USE_DAEMON=1 or set
MSMONITOR_USE_DAEMON=0, model will run successfully;
2.run vllm-ascend model while set MSMONITOR_USE_DAEMON=1, run msMonitor
tool to collect profile data;
3.run vllm-ascend model while set MSMONITOR_USE_DAEMON=1 and
VLLM_TORCH_PROFILER_DIR, will raise error

- vLLM version: v0.10.2
- vLLM main:
f225ea7dd9

Signed-off-by: mei-feiyao <1332490378@qq.com>

vllm_ascend/envs.py

@@ -159,6 +159,9 @@ env_variables: Dict[str, Callable[[], Any]] = {
     # caused by the initialization of the Mooncake connector.
     "PHYSICAL_DEVICES":
     lambda: os.getenv("PHYSICAL_DEVICES", None),
+    # Whether to enable msMonitor tool to monitor the performance of vllm-ascend.
+    "MSMONITOR_USE_DAEMON":
+    lambda: bool(int(os.getenv("MSMONITOR_USE_DAEMON", '0'))),
 }
 
 # end-env-vars-definition