Make Microsoft.ML.Ensemble internals visible to NimbusML DotNetBridge (#4056)

Author: najeeb-kazmi

src/Microsoft.ML.Ensemble/Properties/AssemblyInfo.cs

@@ -9,3 +9,4 @@
 [assembly: InternalsVisibleTo("Microsoft.ML.Core.Tests" + PublicKey.TestValue)]
 [assembly: InternalsVisibleTo("RunTests" + InternalPublicKey.Value)]
 [assembly: InternalsVisibleTo("Microsoft.ML.Runtime.Scope" + InternalPublicKey.Value)]
+[assembly: InternalsVisibleTo("DotNetBridge" + InternalPublicKey.Value)]