Add Transition component

### What problem or need will this feature solve?

Expose the Headless UI transition component.

### How would this feature work?

As documented.

### Additional context

_No response_

### Check all that apply.

- [X] This is a single feature.
- [X] I have [searched the issues](https://github.com/sippy-playform/mellow/issues) for any possible duplications of this feature request.