add non-generic interface and implement it with GraphQLResponse

Author: rose-a

src/GraphQL.Primitives/GraphQLResponse.cs

@@ -6,11 +6,12 @@
 namespace GraphQL
 {
 
-    public class GraphQLResponse<T> : IEquatable<GraphQLResponse<T>?>
+    public class GraphQLResponse<T> : IGraphQLResponse, IEquatable<GraphQLResponse<T>?>
     {
 
         [DataMember(Name = "data")]
         public T Data { get; set; }
+        object IGraphQLResponse.Data => Data;
 
         [DataMember(Name = "errors")]
         public GraphQLError[]? Errors { get; set; }

src/GraphQL.Primitives/IGraphQLResponse.cs

@@ -0,0 +1,11 @@
+namespace GraphQL
+{
+    public interface IGraphQLResponse
+    {
+        object Data { get; }
+
+        GraphQLError[]? Errors { get; set; }
+
+        Map? Extensions { get; set; }
+    }
+}