Starting to separate the esplora client funcionality from business logic

Having a driver will allow us to start experimenting with transaction signing
more easily

side-node/src/lib.rs

@@ -30,7 +30,7 @@ pub async fn run() {
             node.start().await;
         }
         Some(Commands::Btc {}) => {
-            let _ = bitcoin::clients::esplora::run().await;
+            let _ = bitcoin::driver::run().await;
         }
         None => println!("No command provided. Exiting. See --help for more information."),
     }