Remove warnings from `Transformer` methods added in #304

[zzril]

Is your feature request related to a problem?

We decided that the warnings in the Transformer methods added by #304 are unneccessary, so they should be removed.

We're talking about these warnings, e.g. here:

warnings.warn("OneHotEncoder only removes and adds, but does not change any columns.", stacklevel=1)

Desired solution

In all transformers, go through the methods get_names_of_added_columns, get_names_of_changed_columns and get_names_of_removed_columns and remove the warnings.
Update tests accordingly.

Possible alternatives (optional)

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Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

🎉 This issue has been resolved in version 0.13.0 🎉

The release is available on:

• v0.13.0
• GitHub release

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