Make it possible to supply an initial value for useFacetRef

[creativecreature]

Overview

Reacts useRef allows you to supply a default value. When using useFacetRef it can get a little verbose to have to check it against NO_VALUE.

const mockFacet: Facet<string> ....
const ref = useFacetRef(mockFacet) // MutableRefObject<Option<string>>

const mockFacet: Facet<string> ....
const ref = useFacetRef(mockFacet, 'fallback') // MutableRefObject<string>