Session Replay for iOS

[jamescrosswell]

Part of #2136

TODO

Currently not seeing any replays coming through to Sentry. Need to debug the Cocoa SDK or get some logs to see what's going on 😕

From @philprime in slack:

So it seems to me that the Cocoa session tracker is not started, therefore not triggering Session Replay to start.
I can see Started new session in the logs from Maui.
We have two listeners, one for the UIApplicationDidBecomeActiveNotification and one for SentryHybridSdkDidBecomeActive.
...
they are both notifications dispatched via the NotificationCenter and our listeners are installed there. UIApplicationDidBecomeActiveNotification is a default notification sent by iOS when the app is opened and SentryHybridSdkDidBecomeActive is a manual one used by the React Native SDK because they need to delay it.
I don't know how you can dispatch that from .NET but it's a standard component of iOS since iOS 2.0+ so I would expect some way to be there.

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## Unreleased

### Features

- Session Replay for iOS ([#4664](https://github.com/getsentry/sentry-dotnet/pull/4664))

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