Add key subcommand (#1874)

polkadot/cli/src/cli.rs

@@ -52,6 +52,9 @@ pub enum Subcommand {
 		about = "Benchmark runtime pallets."
 	)]
 	Benchmark(frame_benchmarking_cli::BenchmarkCmd),
+
+	/// Key management cli utilities
+	Key(sc_cli::KeySubcommand),
 }
 
 #[allow(missing_docs)]