Get file dependency network from repository snapshot

[sbenthall]

We need to know not just how files depend on commits, but how files depend technically on each other. If we restrict ourselves to Python code, this can be done by (for example) examining import statements.

Using code inspection, examine a project and determine which files depend on each other. I expect there is some open source library you can use to do 90% of this, so please look around and don't reinvent the wheel if you don't have to.

@Aryan-Barbarian @vsporeddy