Broadcast various requests as per #4684 (#4920)

* multiple broadcast flags

* rewrite with single --broadcast option

* satisfy cargo fmt

* shorten sync-committee-messages

* fix a doc comment and a test

* use strum

* Add broadcast test to simulator

* bring --disable-run-on-all flag back with deprecation notice

testing/node_test_rig/src/lib.rs

@@ -21,7 +21,7 @@ pub use eth2;
 pub use execution_layer::test_utils::{
     Config as MockServerConfig, MockExecutionConfig, MockServer,
 };
-pub use validator_client::Config as ValidatorConfig;
+pub use validator_client::{ApiTopic, Config as ValidatorConfig};
 
 /// The global timeout for HTTP requests to the beacon node.
 const HTTP_TIMEOUT: Duration = Duration::from_secs(8);