Function latency_ln_receive 

async fn latency_ln_receive(
    client: &Client,
    gw_lnd: &GatewayClient,
    gw_ldk: &GatewayClient,
    lnd_gw_id: &str,
    iterations: usize,
    assert_thresholds: bool,
) -> Result<()>

Fund the gateway and measure incoming Lightning payment completion.