Add support of dc_power_factor Load Flow Parameter

[jeandemanged]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?

No

What kind of change does this PR introduce?

Feature

What is the current behavior?

PyPowSyBl does not have powsybl-core's dcPowerFactor load flow parameter (powsybl/powsybl-core#2473)

What is the new behavior (if this is a feature change)?
Added dc_power_factor load flow parameter

Does this PR introduce a breaking change or deprecate an API?

• No

Other information:

[jeandemanged]

@EtienneLt @geofjamg @obrix help :(

this sounded like an easy feature, but I cannot understand what is going on in load flow validation, why/where a zero power factor shows up and causes an exception ... ( while LoadFlow and SecurityAnalysis are ok ...)

=========================== short test summary info ============================
FAILED test_loadflow.py::test_validation - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_twt_validation - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_all - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_parameters_not_valid - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_parameters_valid - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_wrong_regulated_bus_id - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0

[jeandemanged]

@EtienneLt @geofjamg @obrix help :(

this sounded like an easy feature, but I cannot understand what is going on in load flow validation, why/where a zero power factor shows up and causes an exception ... ( while LoadFlow and SecurityAnalysis are ok ...)

=========================== short test summary info ============================
FAILED test_loadflow.py::test_validation - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_twt_validation - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_all - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_parameters_not_valid - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_validation_parameters_valid - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0
FAILED test_loadflow.py::test_wrong_regulated_bus_id - pypowsybl._pypowsybl.PyPowsyblError: Invalid DC power factor: 0.0

there was a bug in LoadFlowValidationParameters code, fix: 13e6936