Function spawn_maintenance_tasks 

pub fn spawn_maintenance_tasks<Node, Pool>(
    ctx: &BuilderContext<Node>,
    pool: Pool,
    pool_config: &PoolConfig,
) -> Result<()>
where
    Node: FullNodeTypes,
    Pool: TransactionPoolExt + Clone + 'static,
    Pool::Transaction: PoolTransaction<Consensus = TxTy<Node::Types>>,

Spawn all maintenance tasks for a transaction pool (backup + main maintenance).