feat(runner): add structured logging with tracing

- Add tracing, tracing-subscriber, uuid dependencies
- Replace eprintln! with info! for structured logs
- Add run_id, rust_version, os, arch to benchmark start log

Cargo.toml

@@ -32,6 +32,9 @@ tokio = { version = "1", features = ["full"] }
 tokio-rustls = { version = "0.26", default-features = false, features = [
   "tls12",
 ] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
+uuid = { version = "1", features = ["v4"] }
 
 [workspace.lints.clippy]
 nursery = "warn"