Utility to check that all field in package.json exports have a corresponding file

I want to create something very simple to start learning Rust

• write code for the utility
  • 1. read a package.json
  • 2. check if there is an exports key
  • 3. Add strong types to json
  • 4. recursively navigate exports key
  • 5. when a string is found check that the file specified in it exists
• add format (check rust fmt package for this)
• setup this project as a monorepo (see vercel/turbo or biomejs as example)
• add unit test
• add Github Actions
• add documentation