Move types out of .Core namespace and make method virtual (#2024)

benchmarks/Microsoft.AspNetCore.SignalR.Microbenchmarks/HubConnectionContextBenchmark.cs

@@ -9,7 +9,6 @@ using System.Threading;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Connections;
-using Microsoft.AspNetCore.SignalR.Core;
 using Microsoft.AspNetCore.SignalR.Internal;
 using Microsoft.AspNetCore.Internal;
 using Microsoft.AspNetCore.SignalR.Protocol;

src/Microsoft.AspNetCore.SignalR.Core/DefaultUserIdProvider.cs

@@ -3,11 +3,11 @@
 
 using System.Security.Claims;
 
-namespace Microsoft.AspNetCore.SignalR.Core
+namespace Microsoft.AspNetCore.SignalR
 {
     public class DefaultUserIdProvider : IUserIdProvider
     {
-        public string GetUserId(HubConnectionContext connection)
+        public virtual string GetUserId(HubConnectionContext connection)
         {
             return connection.User?.FindFirst(ClaimTypes.NameIdentifier)?.Value;
         }

src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs

@@ -14,7 +14,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Connections.Features;
 using Microsoft.AspNetCore.Http.Features;
-using Microsoft.AspNetCore.SignalR.Core;
 using Microsoft.AspNetCore.SignalR.Internal;
 using Microsoft.AspNetCore.SignalR.Protocol;
 using Microsoft.Extensions.Logging;

src/Microsoft.AspNetCore.SignalR.Core/HubConnectionHandler.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Connections;
-using Microsoft.AspNetCore.SignalR.Core;
 using Microsoft.AspNetCore.SignalR.Internal;
 using Microsoft.AspNetCore.SignalR.Protocol;
 using Microsoft.Extensions.Logging;

src/Microsoft.AspNetCore.SignalR.Core/IUserIdProvider.cs

@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-namespace Microsoft.AspNetCore.SignalR.Core
+namespace Microsoft.AspNetCore.SignalR
 {
     public interface IUserIdProvider
     {

src/Microsoft.AspNetCore.SignalR.Core/SignalRDependencyInjectionExtensions.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.SignalR;
-using Microsoft.AspNetCore.SignalR.Core;
 using Microsoft.AspNetCore.SignalR.Internal;
 
 namespace Microsoft.Extensions.DependencyInjection