Using alt-tab causes alt modifier to get stuck and breaks tools interaction

[doepnern]

Hey, I noticed that using alt-tab in chrome on Windows to switch tabs will cause the alt modifier to get stuck as no keyup event is registered, which will break any tools that use mouseclick or mousemove for example. You should be able to reproduce this in any of the examples that use any mouseTools. I don't know if there is a good way to handle this, just wanted to let you know as I got quite confused why my the tools seem to get stuck some times

[doepnern]

https://github.com/cornerstonejs/cornerstone3D-beta/blob/b80ea407eaa59da10fe06d0794b0356416410fdc/packages/tools/src/eventDispatchers/keyboardToolEventDispatcher.ts#L9-L12

I just added this for now in enable and disable
window.addEventListener('focusin', resetModifierKey);
window.removeEventListener('focusin', resetModifierKey);