Add AutoML as a best friend assembly to Microsoft.ML.Core (dotnet#3821)

Author: daholste

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

@@ -47,6 +47,8 @@
 [assembly: InternalsVisibleTo(assemblyName: "Microsoft.ML.LightGbm.StaticPipe" + PublicKey.Value)]
 [assembly: InternalsVisibleTo(assemblyName: "Microsoft.ML.TimeSeries.StaticPipe" + PublicKey.Value)]
 
+[assembly: InternalsVisibleTo(assemblyName: "Microsoft.ML.AutoML" + PublicKey.Value)]
+
 [assembly: InternalsVisibleTo(assemblyName: "Microsoft.ML.Internal.MetaLinearLearner" + InternalPublicKey.Value)]
 [assembly: InternalsVisibleTo(assemblyName: "TreeVisualizer" + InternalPublicKey.Value)]
 [assembly: InternalsVisibleTo(assemblyName: "TMSNlearnPrediction" + InternalPublicKey.Value)]