[Auth]: Add auth state stream utility

[nidegen]

Hi there!

Not sure if API extensions are also not allowed, but I figured this little helper could be useful to add some concurrency in Auth.

The struct AuthState is only there to avoid concurrency issues that appear when using a tuple instead.

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[nidegen]

/gemini review

[ncooke3]

Thanks for the PR, @nidegen! Are there use cases where you were intending to use the stream API? As a 1:1 replacement for the callback listener or perhaps in SwiftUI views?

[nidegen]

Just as a 1:1 replacement for the callback listener initially but definitely with SwiftUI tasks in mind:)

Not a big pain point, but I thought it might be welcome!

[nidegen]

Is this still considered? Was thinking of adding similar streams to firestore listeners too.

But happy to close it if it is out of scope:)

[ncooke3]

Thanks @nidegen, sorry for the delay, but yes this is still being considered. In the last few weeks, we've been putting together guidance for streaming API design. Once that is finalized, we will review this. Apologies again for the delay.