Fix nested transitions

[Razboy20]

Transition will now wait for all ChildTransition components underneath to finish transitioning before removing itself. This also fixes early transitionEnd calls by cancelling transition/animation event bubbling. (e.g. if you have a button that you hover over which causes a transition event, this would be accidentally listened to.)

[vercel]

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Name	Status	Preview	Comments	Updated
solid-headless	❌ Failed (Inspect)			Feb 10, 2023 at 4:16PM (UTC)

[Razboy20]

Should also fix #15.

[lxsmnsyc]

Thanks for making this PR! I would like to suggest one thing though: add comments. I know that I don't add it myself (to which I'll do in the foreseeable future) but the reason I would want comments is because I would like to know how this works myself too 🤣

Edit:
As a bonus, I think we could create another Transition example in the examples/ as some sort of early testing

[Razboy20]

Added a couple comments/renamed some variables to hopefully improve the code readability.

Another transition example also sounds like a good idea-maybe might be good to create some more pages to the solid-headless website as well, or be able to view all the examples on there.

[lxsmnsyc]

solid-headless site itself is collecting dusts. I'll be recreating it from scratch again since I found an SSR setup I liked

[lxsmnsyc]

Okay I'll merge this now so I can test this locally, then we can fix whatever needs to be fixed onwards since this is better than me doing nothing for nested transitions 😅