bench pallet: only require Hash instead of Block (#3244)

Preparation for https://github.com/paritytech/polkadot-sdk/issues/2664

Changes:
- Only require `Hash` instead of `Block` for the benchmarking
- Refactor DB types to do the same

## Integration

This breaking change can easily be integrated into your node via:  
```patch
- cmd.run::<Block, ()>(config)
+ cmd.run::<HashingFor<Block>, ()>(config)
```

Status: waiting for CI checks

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: cheme <emericchevalier.pro@gmail.com>

substrate/utils/frame/benchmarking-cli/src/storage/write.rs

@@ -57,7 +57,7 @@ impl StorageCmd {
 		let best_hash = client.usage_info().chain.best_hash;
 		let header = client.header(best_hash)?.ok_or("Header not found")?;
 		let original_root = *header.state_root();
-		let trie = DbStateBuilder::<Block>::new(storage.clone(), original_root).build();
+		let trie = DbStateBuilder::<HashingFor<Block>>::new(storage.clone(), original_root).build();
 
 		info!("Preparing keys from block {}", best_hash);
 		// Load all KV pairs and randomly shuffle them.
@@ -189,7 +189,7 @@ fn convert_tx<B: BlockT>(
 /// if `child_info` exist then it means this is a child tree key
 fn measure_write<Block: BlockT>(
 	db: Arc<dyn sp_database::Database<DbHash>>,
-	trie: &DbState<Block>,
+	trie: &DbState<HashingFor<Block>>,
 	key: Vec<u8>,
 	new_v: Vec<u8>,
 	version: StateVersion,
@@ -220,7 +220,7 @@ fn measure_write<Block: BlockT>(
 /// if `child_info` exist then it means this is a child tree key
 fn check_new_value<Block: BlockT>(
 	db: Arc<dyn sp_database::Database<DbHash>>,
-	trie: &DbState<Block>,
+	trie: &DbState<HashingFor<Block>>,
 	key: &Vec<u8>,
 	new_v: &Vec<u8>,
 	version: StateVersion,