feat: Migrate SAL to Cargo workspace

- Migrate individual modules to independent crates
- Refactor dependencies for improved modularity
- Update build system and testing infrastructure
- Update documentation to reflect new structure

herodo/Cargo.toml

@@ -15,11 +15,11 @@ path = "src/main.rs"
 
 [dependencies]
 # Core dependencies for herodo binary
-env_logger = "0.11.8"
-rhai = { version = "1.12.0", features = ["sync"] }
+env_logger = { workspace = true }
+rhai = { workspace = true }
 
 # SAL library for Rhai module registration
 sal = { path = ".." }
 
 [dev-dependencies]
-tempfile = "3.5"
+tempfile = { workspace = true }