feat: add visualization of decomposition and time series

[Gerhardsa0]

Is your feature request related to a problem?

The user should have an easy time to see the visualization of the time series and the decomposition.
The decomposition of the time series should also be implemented here.

Desired solution

The user should call something like this: ts.plot_time_series() ts.plot_decomposition()

note: the names are not finals

Possible alternatives (optional)

No response

Screenshots (optional)

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Additional Context (optional)

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[lars-reimann]

Other plotting methods use the prefix plot_, so something like plot_decomposition might be appropriate.