Add an "add row" and "add column" event to `gr.DataFrame`

[Kilig947]

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Is it possible to register only the new row or new column listener? I want to automatically give a role type to the first column when I add a new row, but the dataset only has the change method, and he triggers the change when I'm done changing the contents of the row, which is a performance concern!

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I would like to add an add method that is only triggered by adding a new row or a new column

        self.masks_dataset.change(fn=func_signals.mask_setting_role,
                                  inputs=[self.masks_dataset],
                                  outputs=[self.masks_dataset])