Specify how ListBox works with DataProvider

[HerbertsVaadin]

Solves #81

Adds another paragraph under Best Practices:

The List Box API supports using a DataProvider as its data source. However, List Box does not support lazy loading: all items are fetched from the data provider at once. For large data sets, consider using Virtual List or Grid for displaying items, or Combo Box or Multi-Select Combo Box when selection is required.

As well as added "Virtual List" under "Related Components"

Virtual List | Display a large, scrollable list of items with lazy loading and custom item rendering.

[github-actions]

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• components/list-box — modified, +10/-0 lines

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