YUL tree visitor interface (#369)

- Implement the visitor interface. This simplifies working with the AST,
for example transformations into other IRs or collecting and analyzing
various statistics.
- Switch the explorer to use the visitor interface.
- Add the reciprocal function name conversion for function names.
- Some drive-by cosmetic fixes.

---------

Signed-off-by: xermicus <bigcyrill@hotmail.com>

crates/explorer/src/main.rs

@@ -10,6 +10,8 @@ use revive_explorer::{dwarfdump, dwarfdump_analyzer::DwarfdumpAnalyzer, yul_phas
 /// - The count of each YUL statement translated.
 /// - A per YUL statement break-down of bytecode size contributed per.
 /// - Estimated `yul-phaser` cost parameters.
+///
+/// Note: This tool might not be fully accurate, especially when the code was optimized.
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 struct Args {
@@ -26,6 +28,7 @@ struct Args {
     yul_phaser: Option<PathBuf>,
 
     /// Path of the shared object to analyze.
+    /// It must have been compiled with debug info (-g).
     file: PathBuf,
 }