[Documentation] Add C++ in-code profiling example code to the "Profiling Tools" documentation page

### Describe the documentation issue

The "In-code performance profiling" section of the "Profiling Tools" page shows only code in Python. Adding C++ example code can help C++ users utilize the profiling tools in code.

### Page / URL

https://onnxruntime.ai/docs/performance/tune-performance/profiling-tools.html#in-code-performance-profiling

Open the Profiling Tools page at the “In-code performance profiling” section and compare the existing Python examples with the available C++ profiling usage. Add a corresponding C++ example, then verify that the documentation clearly shows C++ users how to profile in code.

Written by the indexing model from the issue text.