[VL] Need Clarification on Java/Scala to Native C++ Handover and Profiling Native C++ Files

### Description

I am exploring the incubator-gluten repository and trying to understand how Java/Scala code interacts with the native C++ code. However, I am having difficulty identifying where and how this handover happens within the codebase.

An explanation on this process would be extremely helpful.

**Java/Scala to C++ Handover** - I want to know the specific parts of the codebase where Java/Scala calls are handed over to native C++ code. I’m unable to locate the key files or classes where this interaction is defined. If there are specific entry points or patterns used for this handover, please provide details.

**Profiling C++ Code** - I’m attempting to use perf to profile the execution and see which C++ functions or files are being called. However, the perf output only shows functions from jibjvm.so or libc.so, and no Gluten or Velox-specific C++ functions are visible. Are there additional configurations or profiling tools recommended for this?