Return new transformer when calling `fit`

[lars-reimann]

Is your feature request related to a problem?

Methods of data containers like Table always return a new data container. The fit method of transformers (safeds.data.tabular.transformation), however, mutates the transformer in place.

Desired solution

• fit should return a new transformer.
• fit_transform should maybe return the fitted transformer and the transformed table.

Possible alternatives (optional)

No response

Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

🎉 This issue has been resolved in version 0.7.0 🎉

The release is available on:

• v0.7.0
• GitHub release

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