Support providing OpenML datasets in other file formats

[PGijsbers]

Moving TODOs from code to issue tracker (#172)

automlbenchmark/amlb/datasets/openml.py

Lines 341 to 350 in 98bf554

	def __init__(self, dataset: OpenmlDataset):
	super().__init__(dataset, "arff") # TODO: fix format
	self._data: dict[str, AM | DF | str] = {}
	def data_path(self, format):
	if format not in __supported_file_formats__:
	raise ValueError(
	f"Dataset {self.dataset._oml_dataset.name} is only available as a file in one of {__supported_file_formats__} formats."
	)
	return self._get_data(format)

I am not 100% sure, but I assume this TODO refers to supporting other file formats for OpenML datasets, such as CSV.