fix: exclude native gRPC assemblies from package content (#33)

Native gRPC assemblies (grpc_csharp_ext.*.dll, libgrpc_csharp_ext.*) were being
packaged as contentFiles, causing them to appear as linked items in Solution
Explorer when consuming the package.

These files are still needed at runtime but should flow through transitively
from the Grpc.Core dependency rather than being bundled in this package.

Author: CalvinAllen

src/CodingWithCalvin.Otel4Vsix/CodingWithCalvin.Otel4Vsix.csproj

@@ -34,9 +34,19 @@
   <ItemGroup>
     <None Include="..\..\README.md" Pack="true" PackagePath="\" />
     <None Include="..\..\assets\icon.png" Pack="true" PackagePath="\" Condition="Exists('..\..\assets\icon.png')" />
-    <None Include="build\CodingWithCalvin.Otel4Vsix.targets" Pack="true" PackagePath="build\" />
   </ItemGroup>
 
+  <!-- Exclude native gRPC assemblies from being packed as content files.
+       These will still be provided transitively via Grpc.Core dependency. -->
+  <Target Name="ExcludeGrpcNativeFromPack" BeforeTargets="GenerateNuspec;_GetPackageFiles">
+    <ItemGroup>
+      <Content Remove="@(Content)" Condition="$([System.String]::new('%(Identity)').EndsWith('grpc_csharp_ext.x64.dll'))" />
+      <Content Remove="@(Content)" Condition="$([System.String]::new('%(Identity)').EndsWith('grpc_csharp_ext.x86.dll'))" />
+      <Content Remove="@(Content)" Condition="$([System.String]::new('%(Identity)').EndsWith('libgrpc_csharp_ext.x64.dylib'))" />
+      <Content Remove="@(Content)" Condition="$([System.String]::new('%(Identity)').EndsWith('libgrpc_csharp_ext.x64.so'))" />
+    </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <PackageReference Include="OpenTelemetry" Version="1.10.0" />
     <PackageReference Include="OpenTelemetry.Api" Version="1.10.0" />