SDK(C#): add optional System.Diagnostics.DiagnosticSource as a dependency

This only exists on .Net 4.6+, so add it conditionally only when target >Netstandard 2.0
(which includes .Net 4.6).

This allows creating activity spans, independently of the tracing framework used.

Signed-off-by: Edwin Török <[email protected]>

Author: edwintorok

ocaml/sdk-gen/csharp/autogen/src/XenServer.csproj

@@ -30,6 +30,9 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Update="FriendlyErrorNames.Designer.cs">
       <DesignTime>True</DesignTime>