fix: allow to set any type of PlotOptions to Navigator.series

[bwajtr]

Description

The Navigator class allows setting additional plot options in the navigator.series attribute → the navigator uses it to configure the small charts that is visible under the main chart.

According to the API spec, you should be able to set any PlotOptions type to the navigator.series attribute (any subclass of AbstractPlotOptions).

However, in the Vaadin Chart Java API, the navigator.series attribute was defined as PlotOptionsSeries - which itself is a subclass of AbstractPlotOptions. During the implementation of Gantt chart support in I faced the issue, that this is not enough, and you can't configure the Navigator as you want this way. For example, you can't use the PlotOptionsGantt as navigator.series because PlotOptionsGantt is not a subclass of PlotOptionsSeries — in fact, none of the PlotOptions*** classes is.

So you cannot do for example the following:

        final PlotOptionsGantt navigatorPlotOptions = new PlotOptionsGantt();
        navigatorPlotOptions.setPointPadding(0.2);
        navigator.setSeries(navigatorPlotOptions);

This change changes the type of the navigator.series attribute to AbstractPlotOptions, so you can set there any plot options and therefore configure the navigator properly.

This change is backwards compatible.

Part of #4731

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/contributing/overview
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.
• I have not completed some of the steps above and my pull request can be closed immediately.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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