Fix option qhull_options and add option orientation for pvgridder.VoronoiMesh2D.generate_mesh()

[keurfonluu]

• Fixed: option qhull_options not passed to internal method. Defaults to None (i.e., Scipy's default).
• Added: option orientation to ensure consistent orientation of polygon faces (default CCW looking from above, i.e., positive normal).

Reminders:

• Run invoke ruff to make sure the code follows the style guide,
• Add tests for new features or tests that would have caught the bug that you're fixing,
• Write detailed docstrings for all functions, classes and/or methods,
• If adding new functionality, unit test it and add it to the documentation.

[antoinecollet5]

@keurfonluu seems ok for me ! Sorry I did not test all cases, and that's a shame that it does not always work.