add options as context for init payload

Author: rose-a

src/GraphQL.Client/GraphQLHttpClientOptions.cs

@@ -61,6 +61,6 @@ public class GraphQLHttpClientOptions
         /// Sets the `ConnectionParams` object sent with the GQL_CONNECTION_INIT message on establishing a GraphQL websocket connection.
         /// See https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md#gql_connection_init.
         /// </summary>
-        public Func<object?> SetWebSocketConnectionInitPayload { get; set; } = () => null;
+        public Func<GraphQLHttpClientOptions, object?> ConfigureWebSocketConnectionInitPayload { get; set; } = options => null;
     }
 }

src/GraphQL.Client/Websocket/GraphQLHttpWebSocket.cs

@@ -115,7 +115,7 @@ public IObservable<GraphQLResponse<TResponse>> CreateSubscriptionStream<TRespons
                         {
                             Id = startRequest.Id,
                             Type = GraphQLWebSocketMessageType.GQL_CONNECTION_INIT,
-                            Payload = Options.SetWebSocketConnectionInitPayload()
+                            Payload = Options.ConfigureWebSocketConnectionInitPayload(Options)
                         };
 
                         var observable = Observable.Create<GraphQLResponse<TResponse>>(o =>