Virtual Scroll on long lists

[danielgolub]

Bug, feature request, or proposal:

When there are very long lists, the performance is very poor.
We would like to have an option to do virtual scroll, which will render only the items on the viewport with some offset.

What is the expected behavior?

Make a template directive like NgFor:

<md-list [virtualScroll]="list">
    <md-list-item *virtualItem="let item; let i = index">
            Item {{i}}
    </md-list-item>
</md-list>

What is the current behavior?

None, currently all the list renders with ngFor. So the performance for thousands of items can be very poor

Which versions of Angular, Material, OS, browsers are affected?

All

[jelbourn]

Tracking virtual scrolling via #823

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