implement conversion to new protobuf-based entity-related orchestration history events, as used by DTS, and enable entities by default when using DTS backend.

Author: sebastianburckhardt

eng/proto

@@ -85,6 +85,12 @@ static void ConfigureSchedulerOptions(
             .Configure(additionalConfig ?? (_ => { }))
             .ValidateDataAnnotations();
 
+        builder.Services.AddOptions<DurableTaskClientOptions>(builder.Name)
+            .Configure(options =>
+            {
+                options.EnableEntitySupport = true;
+            });
+
         builder.Services.TryAddEnumerable(
             ServiceDescriptor.Singleton<IConfigureOptions<GrpcDurableTaskClientOptions>, ConfigureGrpcChannel>());
         builder.UseGrpc(_ => { });