[FEATURE] Add some outputs of interest in CCGT components

[pierre-eliep-met]

What is your precise need ?

We need to create by hand some variables in the models for KPIs, such as Q_reduced = compressor.Q * sqrt(compressor.T_in)/compressor.P_in;, as for the GT, etc.

What solution do you see ?

It would be more handy and robust to have them already created in the components directly

[pierre-eliep-met]

compressor_Qv_in = compressor_Q / compressor.rho_in; also