* feat: Add `createDeferredPromise`

A new function has been added for creating a deferred Promise. Deferred
Promises can be useful for tracking async task, e.g. to prevent async
tasks from overlapping, or to queue up async tasks. We use this pattern
in multiple places in core and the extension.

* Add type parameter for Promise result

This allows creating deferred Promises that return values

* 8.3.0

* Update changelog

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Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Mark Stacey <markjstacey@gmail.com>