service: storage monitor added (#13082)

* service: storage monitor added

Storage monitor added. It uses `notify` create to get notifications
about any changes to monitored path (which is database path).
Notifications are consumed in essential task which terminates when
available storage space drops below given threshold.

Closes: #12399

* Cargo.lock updated

* misspell

* fs events throttling added

* minor updates

* filter out non mutating events

* misspell

* ".git/.scripts/commands/fmt/fmt.sh"

* Update client/service/src/storage_monitor.rs

Co-authored-by: Anton <anton.kalyaev@gmail.com>

* storage-monitor crate added

* cleanup: configuration + service builder

* storage_monitor in custom service (wip)

* copy-paste bad desc fixed

* notify removed

* storage_monitor added to node

* fix for clippy

* publish = false

* Update bin/node/cli/src/command.rs

Co-authored-by: Dmitry Markin <dmitry@markin.tech>

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* crate name: storage-monitor -> sc-storage-monitor

* error handling improved

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <git@kchr.de>

* publish=false removed

Co-authored-by: command-bot <>
Co-authored-by: Anton <anton.kalyaev@gmail.com>
Co-authored-by: Dmitry Markin <dmitry@markin.tech>
Co-authored-by: Bastian Köcher <git@kchr.de>

substrate/client/cli/src/params/database_params.rs

@@ -19,7 +19,7 @@
 use crate::arg_enums::Database;
 use clap::Args;
 
-/// Parameters for block import.
+/// Parameters for database
 #[derive(Debug, Clone, PartialEq, Args)]
 pub struct DatabaseParams {
 	/// Select database backend to use.
@@ -32,7 +32,7 @@ pub struct DatabaseParams {
 }
 
 impl DatabaseParams {
-	/// Limit the memory the database cache can use.
+	/// Database backend
 	pub fn database(&self) -> Option<Database> {
 		self.database
 	}