Function sc_finality_grandpa::light_block_import

pub fn light_block_import<BE, Block: BlockT, Client>(
    client: Arc<Client>, 
    backend: Arc<BE>, 
    genesis_authorities_provider: &dyn GenesisAuthoritySetProvider<Block>, 
    authority_set_provider: Arc<dyn AuthoritySetForFinalityChecker<Block>>
) -> Result<GrandpaLightBlockImport<BE, Block, Client>, ClientError> where
    BE: Backend<Block>,
    Client: ClientForGrandpa<Block, BE>, 

Create light block importer.