Merge pull request #1873 from solliancenet/jdh-image-generation-083

(0.8.3) Add missing image generation resource type

src/dotnet/AIModel/Models/AIModelReference.cs

@@ -21,6 +21,7 @@ public class AIModelReference : ResourceReference
  AIModelTypes.Basic => typeof(AIModelBase),
  AIModelTypes.Completion => typeof(CompletionAIModel),
  AIModelTypes.Embedding => typeof(EmbeddingAIModel),
+ AIModelTypes.ImageGeneration => typeof(ImageGenerationAIModel),
  _ => throw new ResourceProviderException($"The data source type {Type} is not supported.")
  };
  }