Add Line between two systems between 2 area PJM system

[rodrigomha]

c_sys = PSB.build_system(PSISystems, "two_area_pjm_DA")
    new_line = Line(
        name = "C2_D1",
        available = true,
        active_power_flow = 0.0,
        reactive_power_flow = 0.0,
        arc = Arc(from = get_component(ACBus, c_sys, "Bus_nodeC_2"), to = get_component(ACBus, c_sys, "Bus_nodeD_1")),
        r = 0.00297,
        x = 0.0297,
        b = (from = 0.00337, to = 0.00337),
        rating =  40.53,
        angle_limits = (min = -0.7, max = 0.7)
    )
add_component!(c_sys, new_line)