Add while loop support and token pretty printing

The commit adds while loop statements and improves token display
formatting:

- Implements while loop syntax and evaluation - Adds a new token pretty
printing module with configurable formatting - Improves token display
with colors and different output modes

src/frontend/lexer.rs

@@ -1,5 +1,6 @@
 use crate::frontend::source_registry::{SourceId, SourcePosition, SourceSlice};
 use crate::frontend::tokens::{LiteralValue, Token, TokenType};
+use crate::logging::display_token::TokenPrettyPrintExt;
 use crate::result::{LoxError, LoxResult};
 
 pub struct Lexer {
@@ -74,7 +75,7 @@ impl Lexer {
         }
         tokens.push(self.make_token(TokenType::Eof));
         println!("Tokens:");
-        tokens.iter().for_each(|val| println!("{}", val));
+        tokens.iter().for_each(|val| println!("{}", val.pretty()));
         Ok(tokens)
     }