Child trie api changes BREAKING (#4857)

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

substrate/client/network/src/protocol/message.rs

@@ -477,11 +477,6 @@ pub mod generic {
 		pub block: H,
 		/// Child Storage key.
 		pub storage_key: Vec<u8>,
-		/// Child trie source information.
-		pub child_info: Vec<u8>,
-		/// Child type, its required to resolve `child_info`
-		/// content and choose child implementation.
-		pub child_type: u32,
 		/// Storage key.
 		pub keys: Vec<Vec<u8>>,
 	}