[w3c/uievents] KeyboardEvent.getKeyState() (Issue #374)

## Problem 

Current web apps and games have trouble supporting non-modifier combination keys as it's difficult to determine which keys are currently pressed down. 

For modifier key combinations like Shift A, it's straightforward as you can check KeyboardEvent.shiftKey or KeyboardEvent.getModifierState. 

Listening to other types of combinations like A + S requires non-trivial amount of work and error testing. 

## Proposal 

A method that tells you if a non-modifier key is currently pressed down. Similar to KeyboardEvent.getModifierState. 

```js
KeyboardEvent.getKeyState({key: "a"}) 

KeyboardEvent.getKeyState({code: "KeyA"})
```


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