Add the ability to scroll an item into view in the virtual scroller

[pleek91]

Description

Adds a new utility getVirtualScroller where you can get access to a virtual scroller instance by its given name (which is now a prop on the virtual scroller component). This way we can grab a scroller at any point in the component tree. The available actions are

• makeItemVisible - Accepts an itemKey and forces the chunk that item belongs to to be visible
• scrollItemIntoView - Accepts an itemKey and automatically scrolls to that item.

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