Kill the light client, CHTs and change tries. (#10080)

* Remove light client, change tries and CHTs

* Update tests

* fmt

* Restore changes_root

* Fixed benches

* Cargo fmt

* fmt

* fmt

substrate/test-utils/client/src/lib.rs

@@ -45,21 +45,13 @@ use sc_client_api::BlockchainEvents;
 use sc_service::client::{ClientConfig, LocalCallExecutor};
 use serde::Deserialize;
 use sp_core::storage::ChildInfo;
-use sp_runtime::{
-	codec::Encode,
-	traits::{BlakeTwo256, Block as BlockT},
-	OpaqueExtrinsic,
-};
+use sp_runtime::{codec::Encode, traits::Block as BlockT, OpaqueExtrinsic};
 use std::{
 	collections::{HashMap, HashSet},
 	pin::Pin,
 	sync::Arc,
 };
 
-/// Test client light database backend.
-pub type LightBackend<Block> =
-	sc_light::Backend<sc_client_db::light::LightStorage<Block>, BlakeTwo256>;
-
 /// A genesis storage initialization trait.
 pub trait GenesisInit: Default {
 	/// Construct genesis storage.