pub fn verify_multi_proof<Hashing, Key, Value>(
    root: &Hashing::Out,
    proof: &[u8],
    items: &[(Key, Value)],
) -> Result<(), DispatchError>where
    Hashing: Hasher,
    Key: Encode,
    Value: Encode,Expand description
Verify the existence of multiple items in a given trie root and proof.