feat: replay

[vaind]

A small experiment if we can get native replay working on mobile. Currently facing some issues:

Android

1. proguard settings are not copied from android packages during build
2. Unity 2019 has old kotlin version (we need 1.8.0), seems to work on Unity 2022
3. The replay is sent but is just black screen, although, there are some breadcrumbs at least) - we'll either need to provide custom window/view to Android (not sure if that's possible) or implement a custom screenshot recorder, same as in Flutter
4. There are native exceptions; maybe something to do with proguard

    2024/07/24 13:23:12.290 4984 5011 Error Sentry An exception occurred while processing replay event by processor: io.sentry.android.core.PerformanceAndroidEventProcessor
    2024/07/24 13:23:12.290 4984 5011 Error Sentry java.lang.AbstractMethodError: abstract method "io.sentry.SentryReplayEvent io.sentry.EventProcessor.process(io.sentry.SentryReplayEvent, io.sentry.Hint)"
    2024/07/24 13:23:12.290 4984 5011 Error Sentry 	at io.sentry.SentryClient.processReplayEvent(SentryClient.java:547)
    2024/07/24 13:23:12.290 4984 5011 Error Sentry 	at io.sentry.SentryClient.captureReplayEvent(SentryClient.java:300)
    2024/07/24 13:23:12.290 4984 5011 Error Sentry 	at io.sentry.Hub.captureReplay(Hub.java:965)
    2024/07/24 13:23:12.290 4984 5011 Error Sentry 	at io.sentry.HubAdapter.captureReplay(HubAdapter.java:274)
   

iOS

Currently can't test because I don't have a physical iPhone and Unity doesn't build for arm64 simulator. I've tried running on mac as if it was an iPad but replay didn't work - the integration got installed but there were no replays coming through.

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## Unreleased

- replay ([#1736](https://github.com/getsentry/sentry-unity/pull/1736))

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[vaind]

<exec> with cp didn't work on Windows

[bitsandfoxes]

Unity 2019 has old kotlin version (we need 1.8.0), seems to work on Unity 2022

I'd say that's more than fine.

[bruno-garcia]

Unity 2019 has old kotlin version (we need 1.8.0), seems to work on Unity 2022

I'd say that's more than fine.

Yeah if it worked only on the latest version it would also be OK IMO

[bruno-garcia]

@vaind any chance to get this working on Unity 6 at least?