feat: Added SentrySdk.CrashedLastRun

[bitsandfoxes]

This came up through user feedback looking for functionality similar to AppCenter's Crashes.GetLastSessionCrashReportAsync().

Snippet on how to consume the API

// This assumes that the SDK is already initialized and that he SDK has already set 
// up the native scope sync - it will return `Unknown` otherwise
var lastRunState = SentrySdk.CrashedLastRun();

switch (lastRunState)
{
    case Sentry.LastRunState.Crashed:
        // Perform recovery actions or show user message.
        break;
        
    case Sentry.LastRunState.DidNotCrash:
        // Operate normally
        break;
        
    case Sentry.LastRunState.Unknown:
        // The SDK was either not initialized or does not have access to the native layer
        break;
}

Also resolves getsentry/sentry-unity#741

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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[bruno-garcia]

In .NET (JIT-land) we might return DidNotCrash when in fact the app crashed natively. Since we don't capture native crashes when running on JIT on Windows/Mac/Linux. We do capture native crashes Native AOT, or JIT on Android, for example.

[bruno-garcia]

Do we return true if the app crashed with an unhandled C# exception? (On Unity it keeps going, on .NET it crashes)

At first I thought it made sense adding this here too but now thinking to the fact we have this SDK running on UWP and all other weird runtimes where we can't confidently report on this status. It's prob best to keep it on Unity only for now.

[jamescrosswell]

So this would be a superset of the functionality provided by the native libraries (and wrapped in #3958)? As in, this would work for vanilla .NET applications as well?

Also, presumably not relevant for server side apps (like ASP.NET Core)?

[bruno-garcia]

Also, presumably not relevant for server side apps (like ASP.NET Core)?

The server could OOM and crash. And we'd say DidNotCrash

[bitsandfoxes]

Since this came through a Unity SDK user and there we do have confidence in reporting the last run state there, I'm closing this in favour of getsentry/sentry-unity#2049