WIP Move dataframe from pypowsybl to core

[nicolas-pierr]

Please check if the PR fulfills these requirements

• [x] 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)

What kind of change does this PR introduce? Move the dataframes that are implemented in pypowsybl

[nicolas-pierr]

I have some issues with the checkstyle plugin with some of the new syntax offered with the update to java 17. The commit bfe1cfd allows me to pass the checkstyle locally. But I am not sure it is what should be done on the whole powsybl project.

[olperr1]

I have some issues with the checkstyle plugin with some of the new syntax offered with the update to java 17. The commit bfe1cfd allows me to pass the checkstyle locally. But I am not sure it is what should be done on the whole powsybl project.

We are preparing a new powsybl-parent version which will use a newer version of maven-checkstyle-plugin. Once released, your hack will not be necessary.

[olperr1]

The java17 syntax support was merged in main. If you update the branch, you will not need your "hack" anymore.

[sonarqubecloud[bot]]

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