CLI improvements & fixes (#4812)

These are a few changes I missed during the refactoring.

1. Initialization issue and boilerplate

    Most importantly: part of the `Configuration` initialization was done in `sc_cli::init`. This means the user can not benefit from this initialization boilerplate if they have multiple `Configuration` since `sc_cli::init` can only be called once.

2. Boilerplate for `VersionInfo` and `Configuration`

    I'm also answering to the critic of @bkchr on the initialization using version: https://github.com/paritytech/substrate/pull/4692/files/bea809d4c14a2ede953227ac885e3b3f9771c548#r372047238 This will allow initializing a `Configuration` and provide the version by default.

3. Loading the `chain_spec` explicitly

    In the past it was done automatically but in some cases we want to delay this. I moved the code to `Configuration.load_spec()` so it can be called later on. `chain_spec` can also be written directly to the `Configuration` without using this `load_spec` helper.

4. [deleted]

5. Fixing issue that prevents the user to override the port

    In the refactoring I introduced a bug by mistake that could potentially prevent the CLI user to override the ports if defaults where provided for these ports (only on cumulus).

6. Change task_executor from Box to Arc

    This is useful for cumulus where we have 2 nodes with 2 separate Configuration that need to spawn tasks to the same runtime.

7. Renamed TasksExecutorRequired to TaskExecutor

    For consistency.

This is related to https://github.com/paritytech/cumulus/issues/24

This is the continuation (and hopefully the end of) #4692

substrate/utils/browser/src/lib.rs

@@ -51,18 +51,18 @@ where
 		allow_private_ipv4: true,
 		enable_mdns: false,
 	};
-	config.task_executor = Some(Box::new(move |fut| {
+	config.task_executor = Some(Arc::new(move |fut| {
 		wasm_bindgen_futures::spawn_local(fut)
 	}));
 	config.telemetry_external_transport = Some(transport);
 	config.roles = Roles::LIGHT;
 	config.name = format!("{} (Browser)", name);
-	config.database = {
+	config.database = Some({
 		info!("Opening Indexed DB database '{}'...", name);
 		let db = kvdb_web::Database::open(name, 10)
 			.await?;
 		DatabaseConfig::Custom(Arc::new(db))
-	};
+	});
 	config.keystore = KeystoreConfig::InMemory;
 
 	Ok(config)