[Feature Request]: Implement 'DataFrame.get_dummies()' for deferred DataFrame

[PhilippeMoussalli]

What would you like to happen?

We would like to use the DataFrame API to perform one-hot encoding on categorical columns. Currently, this can be done with pd.get_dummies() method but it's currently not supported for deffered DataFrames.

Issue Priority

Priority: 2

Issue Component

Component: dsl-dataframe

[TheNeuralBit]

Let's track this as part of https://github.com/apache/beam/issues/20958