Function sc_rpc::chain::new_light

pub fn new_light<Block: BlockT, Client, F: Fetcher<Block>>(
    client: Arc<Client>, 
    subscriptions: SubscriptionManager, 
    remote_blockchain: Arc<dyn RemoteBlockchain<Block>>, 
    fetcher: Arc<F>
) -> Chain<Block, Client> where
    Block: BlockT + 'static,
    Client: BlockBackend<Block> + HeaderBackend<Block> + BlockchainEvents<Block> + 'static,
    F: Send + Sync + 'static, 

Create new state API that works on light node.