Feature: useDeferred()

[getify]

The useDeferred() hook creates and stores in a state slot (via useState(..)) an object, commonly called a deferred, which is a promise and also its resolve(..) / reject(..) capabilities.

function foo() {
   var { pr, resolve, reject } = useDeferred();
}

Unclear if there's any pattern that would benefit from passing a value to useDeferred(..). Need to further consider.