Update .NET bindings for new Sentry Cocoa SDK

[mattjohnsonpint]

Sentry.Bindings.Cocoa is currently binding to 7.x of the Sentry Cocoa SDK. Recently, 8.0.0 was released, with a lot of breaking changes.

We need to update to the latest 8.x release, and modify the bindings accordingly.

We also need to find a better way to automate the binding generation, so we don't have so much manual work every time we want to update. We should be able to script sharpie bind, and then programmatically apply any patches somehow.

[mattjohnsonpint]

Also: https://docs.sentry.io/platforms/apple/migration/#migrating-from-7x-to-8x

[mattjohnsonpint]

Also, we need to figure out how to include the headers in /Sources/Sentry/include/HybridPublic. We currently point sharpie to the Sentry.xcodeproj to generate bindings. In theory, we could point at headers instead, but I haven't been able to make that work thus far.

[mattjohnsonpint]

Also make sure that .NET defaults are aligned to the iOS defaults, as some (like iOS.EnableAppHangTracking) switched from false to true