Move ITracingDiagnosticListener to SkyWalking.Abstractions

src/SkyWalking.AspNetCore/Diagnostics/ITracingDiagnosticListener.cs → src/SkyWalking.Abstractions/Diagnostics/ITracingDiagnosticListener.cs

@@ -16,7 +16,7 @@
  *
  */
 
-namespace SkyWalking.AspNetCore.Diagnostics
+namespace SkyWalking.Diagnostics
 {
     public interface ITracingDiagnosticListener
     {

src/SkyWalking.AspNetCore/Diagnostics/HostingDiagnosticListener.cs

@@ -22,6 +22,7 @@ using Microsoft.Extensions.DiagnosticAdapter;
 using SkyWalking.Context;
 using SkyWalking.Context.Tag;
 using SkyWalking.Context.Trace;
+using SkyWalking.Diagnostics;
 using SkyWalking.NetworkProtocol.Trace;
 
 namespace SkyWalking.AspNetCore.Diagnostics

src/SkyWalking.AspNetCore/Extensions/ServiceCollectionExtensions.cs

@@ -23,6 +23,7 @@ using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Http;
 using SkyWalking.AspNetCore.Diagnostics;
+using SkyWalking.Diagnostics;
 
 namespace SkyWalking.AspNetCore
 {
@@ -55,7 +56,7 @@ namespace SkyWalking.AspNetCore
             services.AddHttpClient<TracingHttpClient>("sw-tracing");
 
             services.AddSingleton<IHostedService, SkyWalkingHostedService>();
-            services.TryAddSingleton<ITracingDiagnosticListener, HostingDiagnosticListener>();
+            services.AddSingleton<ITracingDiagnosticListener, HostingDiagnosticListener>();
             services.AddTransient<HttpMessageHandlerBuilder, TracingHttpMessageHandlerBuilder>();
             
             return services;

src/SkyWalking.AspNetCore/SkyWalking.AspNetCore.csproj

 <Project Sdk="Microsoft.NET.Sdk">
-   <Import Project="..\..\build\common.props" />
+  <Import Project="..\..\build\common.props" />
   <PropertyGroup>
     <Description>SkyWalking ASP.NET Core Agent.</Description>
     <AssemblyTitle>SkyWalking.AspNetCore</AssemblyTitle>

src/SkyWalking.AspNetCore/SkyWalkingHostedService.cs

@@ -23,9 +23,9 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Options;
-using SkyWalking.AspNetCore.Diagnostics;
 using SkyWalking.Boot;
 using SkyWalking.Config;
+using SkyWalking.Diagnostics;
 using SkyWalking.Remote;
 
 namespace SkyWalking.AspNetCore