[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>

vllm_ascend/__init__.py

@@ -34,4 +34,9 @@ def register_connector():
 
 def register_model_loader():
     from .model_loader.netloader import register_netloader
-    register_netloader()
+    register_netloader()
+
+
+def register_service_profiling():
+    from .profiling_config import generate_service_profiling_config
+    generate_service_profiling_config()