feat: Add lag-plot for time series

[Gerhardsa0]

Is your feature request related to a problem?

When working with time series, a lag plot is useful to see correlation between values and time.
So when implementing this issue, the "lagging" itself must be implemented and the visualization.

Desired solution

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

Possible alternatives (optional)

No response

Screenshots (optional)

No response

Additional Context (optional)

No response

[lars-reimann]

Other plotting functions use the prefix plot_, so something like plot_lagplot would be appropriate. The first plot is a verb, while lagplot is the name of the plot.

[lars-reimann]

🎉 This issue has been resolved in version 0.20.0 🎉

The release is available on:

• v0.20.0
• GitHub release

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