refactor: make PowerGridModelInterface._setup_model a public method

[Thijss]

See title.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vincentkoppen]

Looks good to me, would be nice to have some tests since it is now a public method.

[jaapschoutenalliander]

The PR is fine, I do wonder what use case you have for making the method public?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
66.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Thijss]

The PR is fine, I do wonder what use case you have for making the method public?

Mostly to keep the code readable.
Below is an approximation of our source code:

def get_high_and_low_power_flow_results(grid) -> dict[str, dict]:
    pgm = _setup_pgm_model(grid)  # uses .setup_model()
    pgm_output = {}
    for peak_load in [PeakLoad.HIGH, PeakLoad.LOW]:
        sources = get_sources(grid, peak_load)
        sym_loads = get_loads_per_component(grid, peak_load)
        pgm_output[peak_load] = _calculate_power_flow(pgm, sym_loads, source)
    )
    return pgm_output

def _calculate_power_flow(pgm: PowerGridModelInterface, sym_loads: np.ndarray, source: SourceArray) -> dict[str, np.ndarray]:
    pgm.update_model(update_data={"sym_load": _get_sym_load_updates(sym_loads)})
    pgm.update_model(update_data={"source": _get_source_updates(source)})
    pgm.calculate_power_flow(calculation_method=CalculationMethod.linear)
    return copy(pgm.output_data)