DataSeries could have constructor with list of pojos and two methods that provide data

[vaadin-bot]

Originally by @mstahv

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DataSeries could have constructor with list of pojos and two methods that provide data. This would make it pretty neat to pass a list of entities from backend and two lambda expressions to instantiate a DataSeries for a chart.

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Imported from https://dev.vaadin.com/ issue #14892

[vaadin-bot]

Originally by @mstahv

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Attachment added: EntitySeries.java (1.3 KiB) A prototype implementation for the enhancement idea