Replace log with tracing and record extrinsic info (#535)

* Replace log with tracing for integration tests

* Replace log with tracing

* Use correct tracing lib

* Log extrinsic hash and signature

* Debug extrinsic params

* Replace env_logger

* Replace more env_logger init

* Replace new logs with tracing

* Fix final env_logger

examples/examples/balance_transfer.rs

@@ -35,7 +35,7 @@ pub mod polkadot {}
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    env_logger::init();
+    tracing_subscriber::fmt::init();
 
     let signer = PairSigner::new(AccountKeyring::Alice.pair());
     let dest = AccountKeyring::Bob.to_account_id().into();