Enable NativeAOT analyzers (microsoft#1534)

Author: stephentoub

src/csharp/Microsoft.ML.OnnxRuntimeGenAI.csproj

@@ -16,6 +16,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>onnxruntime-genai.snk</AssemblyOriginatorKeyFile>
+    <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">true</IsAotCompatible>
 
     <!--internal build related properties-->
     <SrcRoot>$(ProjectDir)..\..\src</SrcRoot>