Make coding style consistent with hgvs / enforce black and pylint

[holtgrewe]

There is much more to coding style than indentation and static error analysis with lint. However, these can be enforced automatically.

Looking at the CI files for hgvs, the following appear to be useful:

• black (version should be pinned on installation as format changes slightly over time and black updates should be explicit as not to get whitespace change noise in commits)
• flake8 with reasonable configuration
• isort (probably with profile black)

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[jsstevenson]

I don't necessarily want to close this yet, but we're currently trying to be more purposeful about basing things like styling off of what's defined in the template first. That's entailed a slow (still ongoing) rollout of changes across biocommons - we've made some decisions about configs but are taking our time to populate them out to the repos because we don't want to impact ongoing PR discussions. This repo is pretty clean, though, so we could probably get them done soon.

Broadly, unless there's a repo-specific configuration to implement, I think we generally want to form a consensus around linting/formatting/etc on the example repo first, and go from there.