[Misc][Doc] Add service profiling feature with user guide (#3756)

### What this PR does / why we need it?
To support the data collection capabilities of the msServiceProfiler on
vLLM-ascned framework and enable customization of data collection points
via configuration file, a default profiling configuration has been added
to vllm-ascend, facilitating debugging and optimization for developers
and users.

### Does this PR introduce _any_ user-facing change?
None

### How was this patch tested?

- vLLM version: v0.11.0
- vLLM main:
83f478bb19

Signed-off-by: minghangc <29514143@qq.com>

setup.py

@@ -393,7 +393,8 @@ setup(
         "vllm.general_plugins": [
             "ascend_enhanced_model = vllm_ascend:register_model",
             "ascend_kv_connector = vllm_ascend:register_connector",
-            "ascend_model_loader = vllm_ascend:register_model_loader"
+            "ascend_model_loader = vllm_ascend:register_model_loader",
+            "ascend_service_profiling = vllm_ascend:register_service_profiling"
         ],
     },
 )