Add builder header timeout flag (#5857)

* fix bitvector test random impl

* add a new flag that allows for configuring the timeout for get builder header api calls

* make cli

* add upper limit check, changes based on feedback

* update cli

* capitalization

* cli fix

beacon_node/beacon_chain/src/test_utils.rs

@@ -684,6 +684,7 @@ where
             .set_builder_url(
                 SensitiveUrl::parse(format!("http://127.0.0.1:{port}").as_str()).unwrap(),
                 None,
+                None,
             )
             .unwrap();