[Feature request]: Add CLI entrypoint to the package

[albincorreya]

First of all, the project looks great and thanks for all the work:)

This is just an optional feature request. It would be nice if facetorch can be used as an cli tool (for inference)?
This could be achieved by defining entrypoints in setup.py (reference).

For example something like facetorch --predict -i text.img -o test.img -c config.yaml or any other better alternative structure?

@tomas-gajarsky What you think?