PVF: Add Secure Validator Mode (#2486)

Co-authored-by: Javier Viola <javier@parity.io>

polkadot/cli/src/cli.rs

@@ -88,6 +88,12 @@ pub struct RunCmd {
 	#[arg(long)]
 	pub no_beefy: bool,
 
+	/// Allows a validator to run insecurely outside of Secure Validator Mode. Security features
+	/// are still enabled on a best-effort basis, but missing features are no longer required. For
+	/// more information see <https://github.com/w3f/polkadot-wiki/issues/4881>.
+	#[arg(long = "insecure-validator-i-know-what-i-do", requires = "validator")]
+	pub insecure_validator: bool,
+
 	/// Enable the block authoring backoff that is triggered when finality is lagging.
 	#[arg(long)]
 	pub force_authoring_backoff: bool,

polkadot/cli/src/command.rs

@@ -238,6 +238,8 @@ where
 	let node_version =
 		if cli.run.disable_worker_version_check { None } else { Some(NODE_VERSION.to_string()) };
 
+	let secure_validator_mode = cli.run.base.validator && !cli.run.insecure_validator;
+
 	runner.run_node_until_exit(move |config| async move {
 		let hwbench = (!cli.run.no_hardware_benchmarks)
 			.then_some(config.database.path().map(|database_path| {
@@ -256,6 +258,7 @@ where
 				jaeger_agent,
 				telemetry_worker_handle: None,
 				node_version,
+				secure_validator_mode,
 				workers_path: cli.run.workers_path,
 				workers_names: None,
 				overseer_gen,