Add class of OpenTenCoefficientCompressor

[annahalle]

Open compressors are driven by an external electric motor. Thus, mechanical power is given by 10 coefficient polynomials instead of electrical power. TenCoefficientCompressor is adapted to polynomials calculating mechanical power

[FWuellhorst]

@annahalle Nice, thanks for the new feature. Have you considered just adding a new parameter to the default TenCoefficientCompressor with eta_el=1 as the default?
Or, you could inherit TenCoefficientCompressor and just overwrite calc_electrical_power like this (and overwrite __init__ to add self.assumed_eta_el

    def calc_electrical_power(self, inputs: Inputs, fs_state: FlowsheetState) -> float:
        p_mech = super().calc_electrical_power(inputs=inputs, fs_state=fs_state)
        p_el = p_mech / self.assumed_eta_el
        return p_el

Either way, I just changed some logic in TenCoefficientCompressor in another branch, as T_sc is only required for capacity definition heating. Also, I changed an error when assuming bad eta_mechs. Using inheritance would add these fixes directly to your class, as well.