Support Virtual Environment

[cindytsai]

Support Virtual Environment

• Configure initialization. (ref)
  • Python Initialize Configuration (new in 3.8): https://docs.python.org/3/c-api/init_config.html#python-initialization-configuration
• Py_SetPythonHome
  • Py_SetPythonHome will deprecated in 3.11: https://docs.python.org/3/c-api/init.html#c.Py_SetPythonHome
• Macro for Python version: https://docs.python.org/3/c-api/apiabiversion.html