Add Linting Rules

[highvolt-dev]

Add linting rules for better consistency of code. Incorporate in GitHub Actions.

[asheingold]

Do you have a preferred rule set for linting?

[highvolt-dev]

@asheingold I don't, but if there are several competing opinionated rulesets and one contradicts the existing style more than the other (generates more linting errors), we may want to select the ruleset that most reflects the current codebase so as to minimize the amount of revisions that will be needed to pass the linting tests. That being said the current code was contributed by multiple people and we want consistency. I do like to see Pythonic/idiomatic code.

I don't want to get in the way of you contributing, so I am open-minded about the ruleset selection