Implement `Animation` and `Transaction` structs about tokamak HOT 5 CLOSED

It may be possible to do this using Web Animations, as most/all major browsers have at least some support for it. Otherwise, it may be tricky considering CSS animations have to be specified in a stylesheet, and it would be more difficult to manipulate that at runtime. Here's a post on web animations on the WebKit blog. There's also a polyfill we could use.

Another solution would be having TokamakCore handle animations entirely, and just keep redrawing views with the updated values at a set framerate.

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SwiftUI relies on Transactions to handle animation. If you want to match the SwiftUI API, then Transaction will be necessary.

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Yes, I agree.

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I hope we can avoid scheduling animations manually, I reckon that would be highly inefficient. Especially because crossing the Swift<->JavaScript bridge is quite costly, and this cost will accumulate quite quickly to a noticeable lag when these bridged calls are repeated for every frame.

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What looks like a sensible approach to me is the reliance on the Web Animations API through a polyfill, but I'm very open to a better solution 🤔

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