Virtual Scroll Scroll Snap

#### Feature Description

I would like to use scroll snapping in a horzintal virtual scrolled list. Therefore I would like to use the platforms CSS attribute: `scroll-snap-type`

#### Use Case

Imagine a horizontal list of cards. While scrolling the User is interested in only one Item. For aesthetics he wants this item to be in the middle of his screen. Thats where Scroll snapping would be really handy.

首先定位 Angular virtual-scroll 组件及其水平滚动行为，然后检查是否已有涵盖滚动的组件测试。确定 CSS scroll-snap-type 应如何应用于水平虚拟滚动列表，并将完成标准定义为：可靠地吸附滚动位置，使活动卡片保持居中，同时不破坏虚拟化。

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