Create our initial native library for NativeAOT

[jonathanpeppers]

Android framework version

net10.0-android (Preview)

Affected platform version

.NET 10

Description

Right now "hello world" works for NativeAOT, using only C# and Java code at startup:

• https://github.com/dotnet/android/blob/main/src/Xamarin.Android.Build.Tasks/Resources/NativeAotRuntimeProvider.java

We'll at least need a small native library for the GC Bridge to function, as seen in:

• Hook up more integrations to NativeAOT with Android RIDs #10402

We will need more native code as time goes on.

As a starting point, we should make a version of libmonodroid that is:

• Small, minimal amount of code for NativeAOT to work
• Sets up the GC Bridge
• May need to preload JNI native libraries
• Statically links everything

We could start small and complete #10402 to begin with.