Add support to combine virtual scroll and drag and drop features

[doronsever]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

Make drag and drop workable when rendering a list using a virtual scroll

What is the current behavior?

They don't play nicely together

What are the steps to reproduce?

https://angular-material-dragdrop-virtualscroll.stackblitz.io

Provided a demo on how they both play together, I combined both examples from your website

What is the use-case or motivation for changing an existing behavior?

We have a list that might contain lots of items.
We would like to render it using the material virtual scroll for better performance, the issue is that it breaks our recording drag and drop

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

Angular 7, Material 7.0.1

Is there anything else we should know?

[mmalerba]

Closing this since #10122 is being used to track integration of virtual-scroll and various other components

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