Issue 119 cli for model loading

[cooperlab]

Create a CLI for loading and unloading models.

[cooperlab]

@andsild @RaminNateghi @marinayad @abs711 Please provide feedback on the model loading CLI interface described in the README.

[andsild]

Nice, quite thorough with examples

[RaminNateghi]

That's a great interface that will meet all our needs.
The only thing I'd suggest is making the URL to the Triton server an input argument for the model CLI. The current interface doesn't take in the URL if I'm not mistaken.
By the way, I couldn't find the load_model.py file in the repository directories.