Port GREF logging to .NET 6+ EventSource infrastructure

### Android application type

Android for .NET (net6.0-android, etc.)

### Affected platform version

.NET 6

### Description

The .NET Podcast app shows `dotnet trace` output for:


https://github.com/xamarin/xamarin-android/blob/af2875138afada68a870cc803c3e8dcd2e85ff6f/src/Mono.Android/Android.Runtime/AndroidRuntime.cs#L178-L188

https://github.com/xamarin/xamarin-android/blob/af2875138afada68a870cc803c3e8dcd2e85ff6f/src/Mono.Android/Android.Runtime/AndroidRuntime.cs#L206-L211

This logging is almost always disabled, but we call into unmanaged code to increment an integer.

We could ideally port this logging to EventSource and do everything on the managed side -- avoid p/invoke for these.

### Steps to Reproduce

Get `dotnet trace` output for an .NET 6 app.

### Did you find any workaround?

_No response_

### Relevant log output

_No response_