Remove the service, replacing it with a struct of individual chain components (#6352)

* WIP

* Making progress

* Almost ready

* Get service tests compiling

* Fix node screenshot

* Line widths

* Fix node cli tests

* Fix node cli warning

* ChainComponents -> ServiceComponents, fix tests

* make spawn_handle public

* Remove spawnnamed impl for taskmanager

* Move the keep alive stuff to the task manager

* Move the telemetry, base path, rpc keep_alive to the service builder

* Make the task manager keep alive an internal detail

* Rewrite the browser start_client future

* Remove run_node etc

* Revert my personal changes to browser-demo/build.sh

* use |config|

* Add a runtime_version function to SubstrateCli

* Reexport role and runtime version from sc cli

* Update Cargo.lock

* runtime_version -> native_runtime_version

* Pass chain spec to native_runtime_version for polkadot

* Fix line widths

* Traitify ServiceComponents Client

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

@@ -18,7 +18,7 @@
 use crate::chain_spec;
 use crate::cli::Cli;
 use crate::service;
-use sc_cli::SubstrateCli;
+use sc_cli::{SubstrateCli, RuntimeVersion, Role, ChainSpec};
 
 impl SubstrateCli for Cli {
 	fn impl_name() -> &'static str {
@@ -58,6 +58,10 @@ impl SubstrateCli for Cli {
 			)?),
 		})
 	}
+
+	fn native_runtime_version(_: &Box<dyn ChainSpec>) -> &'static RuntimeVersion {
+		&node_template_runtime::VERSION
+	}
 }
 
 /// Parse and run command line arguments
@@ -71,11 +75,10 @@ pub fn run() -> sc_cli::Result<()> {
 		}
 		None => {
 			let runner = cli.create_runner(&cli.run)?;
-			runner.run_node(
-				service::new_light,
-				service::new_full,
-				node_template_runtime::VERSION
-			)
+			runner.run_node_until_exit(|config| match config.role {
+				Role::Light => service::new_light(config),
+				_ => service::new_full(config),
+			})
 		}
 	}
 }