`useRef` should be compatibles with lit-html's ref directive

 # `useRef` should be compatibles with lit-html's ref directive

`useRef` should be compatibles with lit-html's `ref` directive so that we can take a ref from `useRef` and pass it to the directive.
Lit's refs use `value` and our uses `current` (in React). 

We should implement this in a way that both `value` and `current` work and `useRef` could internally use `createRef`..