feat: generalize some functions in sp-trie (#12376)

* feat: add to_memory_db to StorageProof

* feat: add iter method and generalize iter_nodes

* fmt

* feat: generalize `encode_compact` like `decode_compact`, add to_compact_proof to StorageProof

* fix to_compact_proof

* improve by suggestions

* improve by suggestions

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

substrate/client/rpc/src/state/state_full.rs

@@ -346,7 +346,7 @@ where
 			.and_then(|block| {
 				self.client
 					.read_proof(&block, &mut keys.iter().map(|key| key.0.as_ref()))
-					.map(|proof| proof.iter_nodes().map(|node| node.into()).collect())
+					.map(|proof| proof.into_iter_nodes().map(|node| node.into()).collect())
 					.map(|proof| ReadProof { at: block, proof })
 			})
 			.map_err(client_err)
@@ -498,7 +498,7 @@ where
 						&child_info,
 						&mut keys.iter().map(|key| key.0.as_ref()),
 					)
-					.map(|proof| proof.iter_nodes().map(|node| node.into()).collect())
+					.map(|proof| proof.into_iter_nodes().map(|node| node.into()).collect())
 					.map(|proof| ReadProof { at: block, proof })
 			})
 			.map_err(client_err)

substrate/client/service/src/client/client.rs

@@ -1190,8 +1190,8 @@ where
 		let (proof, count) = prove_range_read_with_child_with_size::<_, HashFor<Block>>(
 			state, size_limit, start_key,
 		)?;
-		// This is read proof only, we can use either LayoutV0 or LayoutV1.
-		let proof = sp_trie::encode_compact::<sp_trie::LayoutV0<HashFor<Block>>>(proof, root)
+		let proof = proof
+			.into_compact_proof::<HashFor<Block>>(root)
 			.map_err(|e| sp_blockchain::Error::from_state(Box::new(e)))?;
 		Ok((proof, count))
 	}