CGo python binding demo

Demonsrate binding for GoLang backend/library code to python lib with ctypes and JSON encode/decode.

Build instructions

docker build . -t pygo-dev
docker create --name pygo-dev pygo-dev
docker cp pygo-dev:/root/src/py_backend_bind/dist/backend_bind-0.0.1-py3-none-any.whl ./
docker rm pygo-dev