[FEA] Support imaginary numbers in cuDF dataframes

Hello, I am trying to store some imaginary numbers as a cudf dataframe column. Each column cell is a list of imaginary numbers. I am wondering what would be the most efficient way to do it as cudf dataframe doesn't support imaginary numbers? Seperating the real and imaginary part is what I am doing now but this is a huge dataset and it is taking a lot of time.