Function ln_node_from_graph 

pub async fn ln_node_from_graph<'a>(
    graph: Arc<Mutex<SimGraph>>,
    routing_graph: Arc<NetworkGraph<&WrappedLog>>,
) -> HashMap<PublicKey, Arc<Mutex<dyn LightningNode + '_>>>

Produces a map of node public key to lightning node implementation to be used for simulations.