Create boxplot for all numerical columns in a `Table`

[lars-reimann]

Is your feature request related to a problem?

Currently, a boxplot can only be created for one column at a time. It would be useful to create one plot that contains boxplots for all numerical columns in a Table.

Desired solution

• Add a method plot_boxplots (note the s) to the Table class
• The method should place the boxplot for each numerical column in a grid
• It should be clear which plot belongs to which column

Possible alternatives (optional)

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Additional Context (optional)

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