Inlcude contact resistance in `plot_voltage_components`

[rtimms]

Description

If the model includes contact resistance, then there isn't a shaded area corresponding to the IR drop from the contact resistance, so there is a gap between the total voltage and the sum of the overpotentials and OCV.

model = pybamm.lithium_ion.SPMe({"contact resistance": "true"})
parameter_values = pybamm.ParameterValues("Chen2020")
parameter_values.update({"Contact resistance [Ohm]": 5e-3}, check_already_exists=False)
experiment = pybamm.Experiment(
    [
        "Discharge at 1C until 2.5 V",
    ]
)
sim = pybamm.Simulation(model, parameter_values=parameter_values, experiment=experiment)
solution = sim.solve()
pybamm.plot_voltage_components(solution)

Motivation

No response

Possible Implementation

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Additional context

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