Add storage cache for child trie and notification internals (#2639)

* child cache, and test failing notifications

* fix tests and no listen child on top wildcard

* remove useless method

* bump impl version

* Update core/client/src/notifications.rs

Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* Update core/client/src/notifications.rs

Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* Update core/client/src/notifications.rs

Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* Update core/client/src/notifications.rs

Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* factoring notification methods to remove some redundant code.

* test child sub removal

* HStorage implementation and some type alias.

* Remove HStorage cache: does not fit

* fix removal

* Make cache use byte length (shared) instead of number of kv

* Make use of hashes cache in rpc

* applying ratio on different lru caches

* Fix format

* break a line

* Remove per element overhead of lru cache.

* typo

substrate/core/client/src/in_mem.rs

@@ -33,7 +33,7 @@ use trie::MemoryDB;
 use consensus::well_known_cache_keys::Id as CacheKeyId;
 
 use crate::error;
-use crate::backend::{self, NewBlockState};
+use crate::backend::{self, NewBlockState, StorageCollection, ChildStorageCollection};
 use crate::light;
 use crate::leaves::LeafSet;
 use crate::blockchain::{self, BlockStatus, HeaderBackend};
@@ -515,7 +515,11 @@ where
 		Ok(())
 	}
 
-	fn update_storage(&mut self, _update: Vec<(Vec<u8>, Option<Vec<u8>>)>) -> error::Result<()> {
+	fn update_storage(
+		&mut self,
+		_update: StorageCollection,
+		_child_update: ChildStorageCollection,
+	) -> error::Result<()> {
 		Ok(())
 	}