CP-44752: 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).
On the newer .Net versions this is already included.

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

We use version 8.0.1, because version 9.0.0 doesn't support .Net 6.0 anymore.

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>