feat: `createServerValue`

[lxsmnsyc]

Summary

This is a PoC for exploring the new serialization method. This PR adds a new primitive called createServerValue which allows users to instanciate server-side values and load those exact values on hydration. This is like resumability for babies.

A great use case of this would be:

// Without createServerValue, this will throw a hydration error 99.9% of the time.
const someRandomData = createServerValue(() => Math.random());

return <h1>Data: {someRandomData}</h1>;

By default, createServerValue should be able to serialize everything the createResource is capable of (as of course they share the same serializer), with the exception of createServerValue having non-blocking serialization assuming that it produces a Promise. This is, of course, is up for debate.

This might also be in conflict with the upcoming async primitive.

How did you test this change?

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Latest commit: cce4056a6333d453c78edcccf4d3c6af19fc9631

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