[Blazor] Enables the client to initiate blazor server-side renders (#13147)

* [Blazor] Allows multiple components as entry points
* Removes all overloads that register a component statically with aborts
  selector.
* Updates render component to have a RenderMode parameter that indicates
  how the component must render. Valid values are Static, Server, and
  ServerPrerendered.
* When using Server or ServerPrerendered we emit marker comments into
  the page that are later used by blazor.server.js to bootrstrap a
  blazor server-side application.

Author: javiercn

src/Analyzers/Analyzers/test/TestFiles/CompilationFeatureDetectorTest/StartupWithMapBlazorHub.cs

@@ -13,7 +13,7 @@ public void Configure(IApplicationBuilder app)
 
             app.UseEndpoints(endpoints =>
             {
-                endpoints.MapBlazorHub<App>("app");
+                endpoints.MapBlazorHub();
             });
         }
 

src/Components/Server/ref/Microsoft.AspNetCore.Components.Server.csproj

@@ -7,7 +7,7 @@
     <Compile Include="Microsoft.AspNetCore.Components.Server.netcoreapp3.0.cs" />
     <Reference Include="Microsoft.AspNetCore.Components.Authorization"  />
     <Reference Include="Microsoft.AspNetCore.Components.Web"  />
-    <Reference Include="Microsoft.AspNetCore.DataProtection"  />
+    <Reference Include="Microsoft.AspNetCore.DataProtection.Extensions"  />
     <Reference Include="Microsoft.AspNetCore.SignalR"  />
     <Reference Include="Microsoft.AspNetCore.StaticFiles"  />
     <Reference Include="Microsoft.Extensions.Caching.Memory"  />

src/Components/Server/ref/Microsoft.AspNetCore.Components.Server.netcoreapp3.0.cs

@@ -8,20 +8,12 @@ public sealed partial class ComponentEndpointConventionBuilder : Microsoft.AspNe
         internal ComponentEndpointConventionBuilder() { }
         public void Add(System.Action<Microsoft.AspNetCore.Builder.EndpointBuilder> convention) { }
     }
-    public static partial class ComponentEndpointConventionBuilderExtensions
-    {
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder AddComponent(this Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder builder, System.Type componentType, string selector) { throw null; }
-    }
     public static partial class ComponentEndpointRouteBuilderExtensions
     {
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, System.Type type, string selector) { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, System.Type type, string selector, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, System.Type componentType, string selector, string path) { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, System.Type componentType, string selector, string path, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub<TComponent>(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string selector) where TComponent : Microsoft.AspNetCore.Components.IComponent { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub<TComponent>(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string selector, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) where TComponent : Microsoft.AspNetCore.Components.IComponent { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub<TComponent>(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string selector, string path) where TComponent : Microsoft.AspNetCore.Components.IComponent { throw null; }
-        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub<TComponent>(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string selector, string path, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) where TComponent : Microsoft.AspNetCore.Components.IComponent { throw null; }
+        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints) { throw null; }
+        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) { throw null; }
+        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string path) { throw null; }
+        public static Microsoft.AspNetCore.Builder.ComponentEndpointConventionBuilder MapBlazorHub(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string path, System.Action<Microsoft.AspNetCore.Http.Connections.HttpConnectionDispatcherOptions> configureOptions) { throw null; }
     }
 }
 namespace Microsoft.AspNetCore.Components.Server