try-runtime::fast-forward (#12896)

* try-runtime::fast-forward

* Revert un`pub`ing command's fields

* Handle storage change failure

* Adjust Substrate node

* Feature-gated imports

* doc link

* Feature-gated imports in node-template

* Move trait, blanket implementation and auxiliary functions to a new module

* Distinguish between plain babe+timestamp and substrate enhanced info

* Remove uncles inherents

* Missing argument

* Add doc comment about `blocktime_millis`

* Add licenses

substrate/bin/node-template/node/src/command.rs

@@ -10,6 +10,9 @@ use sc_cli::{ChainSpec, RuntimeVersion, SubstrateCli};
 use sc_service::PartialComponents;
 use sp_keyring::Sr25519Keyring;
 
+#[cfg(feature = "try-runtime")]
+use try_runtime_cli::block_building_info::timestamp_with_aura_info;
+
 impl SubstrateCli for Cli {
 	fn impl_name() -> String {
 		"Substrate Node".into()
@@ -184,11 +187,13 @@ pub fn run() -> sc_cli::Result<()> {
 				let task_manager =
 					sc_service::TaskManager::new(config.tokio_handle.clone(), registry)
 						.map_err(|e| sc_cli::Error::Service(sc_service::Error::Prometheus(e)))?;
+				let info_provider = timestamp_with_aura_info(6000);
+
 				Ok((
 					cmd.run::<Block, ExtendedHostFunctions<
 						sp_io::SubstrateHostFunctions,
 						<ExecutorDispatch as NativeExecutionDispatch>::ExtendHostFunctions,
-					>>(),
+					>, _>(Some(info_provider)),
 					task_manager,
 				))
 			})