scale_datasets interface too restrictive

[tjlane]

currently, we have this, which makes life challenging with regards to fixed column names

def scale_datasets(
    *,
    reference_dataset: rs.DataSet,
    dataset_to_scale: rs.DataSet,
    column_to_compare: str = "F",
    uncertainty_column: str = "SIGF",
    weight_using_uncertainties: bool = True,
) -> rs.DataSet:

@alisiafadini let's write down what we would want instead

[tjlane]

resolved by #27