Function sc_consensus_manual_seal::import_queue

pub fn import_queue<Block, Transaction>(
    block_import: BoxBlockImport<Block, Transaction>, 
    spawner: &impl SpawnEssentialNamed, 
    registry: Option<&Registry>
) -> BasicQueue<Block, Transaction> where
    Block: BlockT,
    Transaction: Send + Sync + 'static, 

Instantiate the import queue for the manual seal consensus engine.