RKLLM conversion and inference in C++ and Python

[RiddhiRaj]

No description provided.

[Prem-Swarup]

don't comment out anything from global .gitignore like *.so, instead use negation like !librkllmrt.so for any particular file you want to be tracked by git. I have committed the fix for now, but make sure to follow this in future.
don't put all code for inference in a single .cpp file, create separate source code for different classes (like RKLLMApp) you are defining and use them in main.cpp file having main() function importing all necessary files and code from other files.