Port codemods to TypeScript, add codemods for replacing Nudge and SidebarTab components

[brandongregoryscott]

Overview

This PR overhauls our codemods directory and adds two new codemods, one for removing SidebarTab components (replacing with Tab direction="horizontal") and one for removing Nudge components (replacing with Pulsar where possible).

• codemods directory is now written in TypeScript and added to the build process
• jscodeshift has been updated
• Lots of fluent-style utility functions have been added around jscodeshift to help reduce duplicated code & improve readability

There are a decent amount of tests, but not all of the new utility functions are tested. We can continue to back-fill these as new codemods are added, in addition to the regular input/output transformation tests.

Also... I noticed we were bundling up *.test.js files the main package. Looks like the glob for the build-commonjs and build-esm scripts is not picking up all of the test files, so excluding them explicitly from the files array in the package.json should tidy our distribution up a little!

Screenshots (if applicable)

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [ ] Added / modified Storybook stories

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