Consider a second library to make it easier to use the SDK from SwiftUI

[lawrence-forooghian]

From #9 (comment)

That said, we could maybe consider later on adding a second library that adds types that make it easy to work with the SDK from SwiftUI, the same way that the JS team is currently writing a React Hooks library for the JS SDK.

I don't yet know whether there's actually going to be a need for this, but consider e.g. some stateful @Observable type that provides you with a single list of messages to populate your UI.

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