Setup python virtual environment for the native mode installer

[s-akhtar-baig]

The existing installer helps deploy required services to run the InstructLab UI on a local machine in the native mode. However, there are potential areas of improvement to bring a more streamlined installer to the end users:

• Check if running in the default python virtual environment
  • If the default virtual environment doesn’t exist, then setup a new virtual environment with InstructLab specific name
  • Activate the default virtual environment