Improve test runner

[Brianzchen]

Currently yarn test just runs every test, and if you want to filter it down you have to comment out test suites which is a really clunky process. Maybe some cli options with mocha or swap out to jest or something

[Brianzchen]

After reading about RuleTester it's just a node script that runs and outputs. We'll need to write some extra logic maybe a --onlyChanged option that will read what is git unstaged to run only a subset of tests similar to how jest works