✨ Add completion block for stop function.

[fortmarek]

Checklist

• [ ] Added tests (if applicable)

In some cases, it is necessary to wait for completion of animation of stop function.

I am not sure how exactly I can test this, so ideas in this regard are welcome 🙂

I tried it out in one of our projects where this was causing an issue and it worked like a charm ✨

[github-actions[bot]]

@fortmarek your pull request is missing a changelog!