Duplicate definition of CreateSubscriptionStream extension methods

[ducvietcao]

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The overloads of the extension methods CreateSubscriptionStream() accepting the defineResponseType argument (allowing to use anonymous response types) are defined twice, namely:

1. in GraphQL.Client.Abstractions.GraphQLClientExtensions
2. in GraphQL.Client.Http.GraphQLHttpClientExtensions

This code will fail to compile:

using GraphQL.Client.Abstractions;
using GraphQL.Client.Http;
using GraphQL.Client.Serializer.SystemTextJson;

var client = new GraphQLHttpClient("http://example.com/", new SystemTextJsonSerializer());
var request = new GraphQLHttpRequest();
var defineResponseType = () => new { Foo = "" };

client.SendQueryAsync(request, defineResponseType);           // OK
client.CreateSubscriptionStream(request, defineResponseType); // CS0121: The call is ambiguous

I know that there are several ways to avoid this conflict (Don't use anonymous types / Don't import GraphQL.Client.Abstractions / Use the fully qualified method name), but I assume that this redundancy is not intended and that the second occurence should be removed, thus keeping all methods for anonymous types in the GraphQL.Client.Abstractions package.