[useMeasure] Ability to track a custom Ref

Is your feature request related to a problem? Please describe.

Currently useMeasure returns a ref which needs to be assigned a ref in the JSX. This has 2 issues:

1. The ref is not a real useRef for eg. Does not have ref.current as a prop.
2. If I already have a component where I have a ref, I just want to track its size changes.

Describe the solution you'd like

An API of this shape: const {width, height ... } = useMeasure({ref: currentRef});

Describe alternatives you've considered

I am using https://github.com/ZeeCoder/use-resize-observer ... in the absence of the above which I want to remove.