Add eslint, prettier, import sorting

[briancavalier]

Still some settings to tweak here:

1. I prefer comma-separated fields for record types. Not sure how to set that instead of the default semicolons.
2. Figure out if using some of ESLint/VSCode's suggestions (such as using never instead of any) actually work in this project.

[Frikki]

I have recently set up ESLint with Prettier, import sorting, sort destructure keys, import resolver for TypeScript, stylelint, etc. Maybe we can share our experiences?