Add createDynamic utility.

[DaniGuardiola]

Summary

Dynamic is very helpful for polymorphism use-cases. However, in libraries, there's a potential optimization to be leveraged by not performing a prop split, and leaving that detail to the library author.

For this purpose, I've extracted most of the logic in Dynamic into a createDynamic utility (now used by Dynamic under the hood.

In my case (Ariakit Solid), due to how things are laid out, I can effectively fulfill this API without splitting, which wouldn't be doable with Dynamic alone.

How did you test this change?

TODO

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