Add entrypoint scripts + pyproject.toml + install self in container

[dchaley]

This adds 4 independent entry point scripts:

• preprocess.py
• infer.py
• postprocess.py
• visualize.py

These implement the 3 phases plus an optional visualization step.

We added the pyproject to facilitate installing the module itself– we'll test shortly by building the container 😎

Paired with @WeihaoGe1009

Fixes #222