APIs for components to persist state across circuits manually

[javiercn]

This is tracking the next piece of #27576. (Pointing out that this issue has additional 20 reactions)

We want to provide the ability for circuits to be paused and stored in "permanent" storage to make possible certain scenarios:

• Migrating circuits across servers.
• Freeing up resources when the circuits become idle.
• Enabling reconnection to an existing session even after the circuit has been discarded.

Our goal is that circuits stored this way can be restored in a similar fashion as when they are restored after prerendering.

Important note

This is not a suggestion that circuits could automatically be persisted in their entirety. In general that's not possible as much of the system state is not even serializable, and we don't require developers only to work with serializable data. Rather, what we may be able to do here is provide some APIs by which you can load and save state in your components, so that if a user loses their circuit, we can reload that manually-saved state in the new circuit. It could not be a global or automatic thing.

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