* simplify `useFlags`
* add new `useTransitionData` hook
* use new `useTransitionData` hook
* add ability to cancel transitions mid-transition
* handle cancellations in both directions properly
* re-use existing `prepareTransition`
* expose `data-*` attributes for transitions in `<Transition />` component
* update tests to reflect added data attributes
* update changelog
* only call `getAnimations` if available
This has been around since 2020, but JSDOM doesn't know about this yet,
so tests using JSDOM will fail otherwise.
Robin Malfait
6b6c259010