feat: Add service manager support

- Add a new service manager crate for dynamic service management
- Integrate service manager with Rhai for scripting
- Provide examples for circle worker management and basic usage
- Add comprehensive tests for service lifecycle and error handling
- Implement cross-platform support for macOS and Linux (zinit/systemd)

rhai/Cargo.toml

@@ -30,6 +30,11 @@ sal-text = { path = "../text" }
 sal-net = { path = "../net" }
 sal-zinit-client = { path = "../zinit_client" }
 sal-kubernetes = { path = "../kubernetes" }
+sal-service-manager = { path = "../service_manager", features = ["rhai"] }
+
+
+[features]
+default = []
 
 [dev-dependencies]
 tempfile = { workspace = true }