fix(storage): types

[atk]

docs(storage): resource usage

This simplifies the types considerably and corrects the documentation on how to use a persisted state with createResource.

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Latest commit: 348974b

The changes in this PR will be included in the next version bump.

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@solid-primitives/storage	Minor

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[thetarnav]

You really like using Object.assign for some reason.
I find it much harder to read and understand.
What's the idea behind it?

[atk]

The idea is mostly about TS, because it lets you keep the original type information, which is impossible if you generate the tuple yourself.

[thetarnav]

Object.assign is the only part I'm questioning really. I would prefer typecasting as any. But if you're fine with it, I don't have other comments.

[atk]

The problem with typecasting is that the generics can clash. It is very difficult to get around that, hence why I prefer Object.assign.