[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>

docs/source/developer_guide/performance/index.md

@@ -1,9 +1,10 @@
 # Performance
 
-:::{toctree}
+::::{toctree}
 :caption: Performance
 :maxdepth: 1
 performance_benchmark
 profile_execute_duration
 optimization_and_tuning
-:::
+service_profiling_guide
+::::