PandasInterface does not handle repeating dimensions on conversion

[philippjfr]

If you give the PandasInterface some dataset to convert to a DataFrame and the key and value dimensions repeat in some form it will incorrectly create two columns of the same name. We should uniquify the columns before creating the DataFrame.

hv.Points(([1, 2, 3], [1, 2, 3]), ['A', 'B'], ['A'], datatype=['dataframe'])

[github-actions]

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