Add chainRef/chainRefList utilities

[greglittlefield-wf]

Motivation

There are some cases in which you may want to set multiple refs on a component.

In particular, when using forwardRef or ref props, you may have a ref set by the consumer of the component in addition to an internal ref that need to be set on the same component.

Solution

• Add utilities to "chain" multiple refs into one:
  • chainRefs
  • chainRefList
• Add tests

Testing

• Verify tests pass (i.e., CI passes)