Dark mode for plots

[lars-reimann]

Is your feature request related to a problem?

While we don't want individual styling options for plots, a nice, consistent dark mode would improve integration into IDEs.

Desired solution

Add a new, optional, keyword-only parameter theme to all plot methods of ColumnPlotter and TablePlotter.

Type: Literal["dark", "light"]
Default value: "light"

• The same plot should have a consistent look for each theme.
• Different plots should have a consistent look for different themes.

Possible alternatives (optional)

No response

Screenshots (optional)

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Additional Context (optional)

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