Functional table transformer

[lars-reimann]

Is your feature request related to a problem?

Currently, users can transform a table either with a TableTransformer or with the methods of Table. However, only a TableTransformer can be used in a SequentialTableTransformer (see #802).

Desired solution

• Add a new class FunctionalTableTransformer
• Superclass: TableTransformer
• Constructor parameters:
  • transformer: Callable[[Table], Table] The function transforms a table and returns the transformed table.
• is_fitted: Always True, immediately after constructing the model.
• fit: Is a no-OP. Just return self.
• transform: Call the transformer you got in the constructor and return the result.

Possible alternatives (optional)

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[wastedareas]

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