Is your feature request related to a problem?

It would be useful to know which columns get added, changed, or removed by a TableTransformer.

Desired solution

The TableTransformer abstract base class should get three new abstract methods:

• get_names_of_added_columns
• get_names_of_changed_columns
• get_names_of_removed_columns

Each of them should return a list of strings in correct order. All subclasses of TableTransformer must implement these methods. The docstrings of the subclasses should also describe how columns are affected by the transformer.

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