Auto Enforce Relative Imports Policy

[rmorshea]

Current Situation

I tend to avoid relative imports that back out of the current directory. It can be discouraging to nitpick things like imports so we should automate this policy.

Proposed Actions

We should use a flake8 plugin that bans relative imports outside the current directory.

Work Items

Add flake8-tidy-imports with the following config:

[flake8]
ban-relative-imports = parents