Change Dictionary type

Author: torosent

src/Client/Core/OrchestrationMetadata.cs

@@ -82,7 +82,7 @@ public OrchestrationMetadata(string name, string instanceId)
     /// <summary>
     /// Gets the tags associated with the orchestration instance.
     /// </summary>
-    public IDictionary<string, string> Tags { get; } = new Dictionary<string, string>();
+    public IReadOnlyDictionary<string, string> Tags { get; init; }
 
     /// <summary>
     /// Gets the failure details, if any, for the orchestration instance.

src/Client/Grpc/GrpcDurableTaskClient.cs

@@ -467,13 +467,9 @@ OrchestrationMetadata CreateMetadata(P.OrchestrationState state, bool includeInp
             SerializedCustomStatus = state.CustomStatus,
             FailureDetails = state.FailureDetails.ToTaskFailureDetails(),
             DataConverter = includeInputsAndOutputs ? this.DataConverter : null,
+            Tags = new Dictionary<string, string>(state.Tags),
         };
 
-        foreach (var tag in state.Tags)
-        {
-            metadata.Tags.Add(tag.Key, tag.Value);
-        }
-
         return metadata;
     }
 }