Function node_height 

pub fn node_height<'a, L, C, K>(
    wallet_inst: Arc<Mutex<Box<dyn WalletInst<'a, L, C, K>>>>,
    keychain_mask: Option<&SecretKey>,
) -> Result<NodeHeightResult, Error>
where
    L: WalletLCProvider<'a, C, K>,
    C: NodeClient + 'a,
    K: Keychain + 'a,

node height