Write bench-tps in terms of client (#3904)

* Write bench-tps in terms of client

* Add transactions_addr method for logging

* Move cluster config outside do_bench_tps

* Add BankClient test

sdk/src/client.rs

@@ -16,7 +16,9 @@ use crate::transaction;
 use crate::transport::Result;
 use std::io;
 
-pub trait Client: SyncClient + AsyncClient {}
+pub trait Client: SyncClient + AsyncClient {
+    fn transactions_addr(&self) -> String;
+}
 
 pub trait SyncClient {
     /// Create a transaction from the given message, and send it to the