Crafting Interpreters, except in Rust

I have really been enjoying following along with Crafting Interpreters by @munificent, but I enjoy writing rust more than java, so I started adapting the code in the book.

• [x] Scanning (branch: 01-scanning)
• [ ] Representing Code
• [ ] Parsing Expressions
• [ ] Evaluating Expressions
• [ ] Statements and State
• [ ] Control Flow
• [ ] Functions
• [ ] Resolving and Binding
• [ ] Classes
• [ ] Inheritance