Service for handling keyboard vs. mouse focus behavior

Currently, we always show a focus effect on the button component, when there was no mouse event the last 100ms.

This is really hard-coded and there are bugs. For example, switching browser tabs, is restoring focus and showing the focus-effect (should not happen).

A service for interaction, which detects the last interaction type would solve that issue very elegant and would be also helpful for other components.

I also implemented that in Material 1 (still pending after re-submit) and I would like to implement it in Material 2 as well.

So let me know if you need this, and I will implement it 😃

[jelbourn]

Having a service would be good. Feel free to put together a PR!

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