Add wait for max stake command (#13532)

cli/src/cluster_query.rs

@@ -318,6 +318,17 @@ impl ClusterQuerySubCommands for App<'_, '_> {
                         .help("Display the full transactions"),
                 )
         )
+        .subcommand(
+            SubCommand::with_name("wait-for-max-stake")
+                .about("Wait for the max stake of any one node to drop below a percentage of total.")
+                .arg(
+                    Arg::with_name("max_percent")
+                        .long("max-percent")
+                        .value_name("PERCENT")
+                        .takes_value(true)
+                        .index(1),
+                ),
+        )
     }
 }
 
@@ -1400,6 +1411,16 @@ pub fn process_show_stakes(
         .formatted_string(&CliStakeVec::new(stake_accounts)))
 }
 
+pub fn process_wait_for_max_stake(
+    rpc_client: &RpcClient,
+    config: &CliConfig,
+    max_stake_percent: f32,
+) -> ProcessResult {
+    let now = std::time::Instant::now();
+    rpc_client.wait_for_max_stake(config.commitment, max_stake_percent)?;
+    Ok(format!("Done waiting, took: {}s", now.elapsed().as_secs()))
+}
+
 pub fn process_show_validators(
     rpc_client: &RpcClient,
     config: &CliConfig,