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/client/cli/src/params.rs

@@ -936,6 +936,7 @@ impl RunCmd {
 		crate::update_config_for_running_node(
 			&mut config,
 			self,
+			&version,
 		)?;
 
 		crate::run_node(config, new_light, new_full, &version)
@@ -1003,7 +1004,7 @@ impl ExportBlocksCmd {
 
 		crate::fill_config_keystore_in_memory(&mut config)?;
 
-		if let DatabaseConfig::Path { ref path, .. } = &config.database {
+		if let DatabaseConfig::Path { ref path, .. } = config.expect_database() {
 			info!("DB path: {}", path.display());
 		}
 		let from = self.from.as_ref().and_then(|f| f.parse().ok()).unwrap_or(1);
@@ -1124,7 +1125,7 @@ impl PurgeChainCmd {
 
 		crate::fill_config_keystore_in_memory(&mut config)?;
 
-		let db_path = match config.database {
+		let db_path = match config.expect_database() {
 			DatabaseConfig::Path { path, .. } => path,
 			_ => {
 				eprintln!("Cannot purge custom database implementation");