Add common sponsors metadata to assemblies

This will allow reading these values from arbitrary tools.

Author: kzu

src/Directory.Build.targets

@@ -115,6 +115,11 @@
     </EmbeddedResource>
   </ItemGroup>
 
+  <ItemGroup Label="Sponsors">
+    <AssemblyMetadata Include="Funding.PublicKey" Value="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" />
+    <AssemblyMetadata Include="Funding.GitHub" Value="devlooped" />
+  </ItemGroup>
+
   <Target Name="IsPackable" Returns="@(IsPackable)">
     <ItemGroup>
       <IsPackable Include="$(MSBuildProjectFullPath)" IsPackable="$(IsPackable)" PackageId="$(PackageId)" />