Add BenchTpsClient trait (#24208)

* Add BenchTpsClient

* Impl BenchTpsClient for used clients

* Use BenchTpsClient in do_bench

* Update integration test to use faucet via rpc

* Support keypairs from file that are not prefunded

* Remove old perf-utils

client/src/thin_client.rs

@@ -171,7 +171,7 @@ impl ThinClient {
         &self.tpu_addrs[self.optimizer.best()]
     }
 
-    fn rpc_client(&self) -> &RpcClient {
+    pub fn rpc_client(&self) -> &RpcClient {
         &self.rpc_clients[self.optimizer.best()]
     }