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

git/Cargo.toml

@@ -8,13 +8,14 @@ repository = "https://git.threefold.info/herocode/sal"
 license = "Apache-2.0"
 
 [dependencies]
-regex = "1.8.1"
-redis = "0.31.0"
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-rhai = { version = "1.12.0", features = ["sync"] }
-log = "0.4"
-url = "2.4"
+# Use workspace dependencies for consistency
+regex = { workspace = true }
+redis = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+rhai = { workspace = true }
+log = { workspace = true }
+url = { workspace = true }
 
 [dev-dependencies]
-tempfile = "3.5"
+tempfile = { workspace = true }