Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices now obsolete

## Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices now obsolete
The contents of the following NuGet packages have all been unnecessary since ASP.NET Core 2.1, and so are now being marked as obsolete:
- Microsoft.AspNetCore.SpaServices
- Microsoft.AspNetCore.NodeServices

For the same reason, the following NPM modules are being marked as deprecated:
- aspnet-angular
- aspnet-prerendering
- aspnet-webpack
- aspnet-webpack-react
- domain-task

These packages and NPM modules will later be removed in .NET 5.

### Version introduced
3.0

### Old behavior
The deprecated packages and NPM modules were available for use to integrate ASP.NET Core with various single-page app (SPA) frameworks, including Angular, React, and React + Redux.

### New behavior
A new integration mechanism exists in the package `Microsoft.AspNetCore.SpaServices.Extensions` and remains the basis of our Angular and React project templates since ASP.NET Core 2.1.

### Reason for change
ASP.NET Core supports integration with various single-page app (SPA) frameworks, including Angular, React, and React + Redux. Initially integration with these frameworks was accomplished with ASP.NET Core specific components that handled scenarios like server-side prerendering and integration with webpack. But as time went on, industry standards changed and the SPA frameworks each released their own standard command-line interfaces (e.g., Angular CLI, create-react-app).

When ASP.NET Core 2.1 was released in May 2018, we responded to the change in standards by providing a newer and simpler way to integrate with the SPA frameworks' own toolchains. This new integration mechanism exists in the package `Microsoft.AspNetCore.SpaServices.Extensions` and remains the basis of our Angular and React project templates since ASP.NET Core 2.1.

To clarify that the older ASP.NET Core specific components are not relevant or recommended, we are now officially obsoleting the pre-2.1 integration mechanism and marking the supporting NPM packages as deprecated.

### Recommended action
If you are using these packages, please update your apps to use the functionality in Microsoft.AspNetCore.SpaServices.Extensions instead along with the functionality provided by the SPA frameworks you are using. To enable features like server-side prerendering and hot module reload please refer to the documentation for the corresponding SPA frameworks. The functionality in Microsoft.AspNetCore.SpaServices.Extensions is *not* obsolete and will continue to be supported.

### Category
ASP.NET Core

### Affected APIs
- [Microsoft.AspNetCore.Builder.SpaRouteExtensions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.builder.sparouteextensions?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.Builder.WebpackDevMiddleware](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.builder.webpackdevmiddleware?view=aspnetcore-2.2)

- [Microsoft.AspNetCore.NodeServices.EmbeddedResourceReader](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.embeddedresourcereader?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.INodeServices](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.inodeservices?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.NodeServicesFactory](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.nodeservicesfactory?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.NodeServicesOptions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.nodeservicesoptions?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.StringAsTempFile](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.stringastempfile?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.HostingModels.INodeInstance](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.hostingmodels.inodeinstance?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.HostingModels.NodeInvocationException](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.hostingmodels.nodeinvocationexception?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.HostingModels.NodeInvocationInfo](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.hostingmodels.nodeinvocationinfo?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.HostingModels.NodeServicesOptionsExtensions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.hostingmodels.nodeservicesoptionsextensions?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.NodeServices.HostingModels.OutOfProcessNodeInstance](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.nodeservices.hostingmodels.outofprocessnodeinstance?view=aspnetcore-2.2)

- [Microsoft.AspNetCore.SpaServices.Prerendering.ISpaPrerenderer](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.ispaprerenderer?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Prerendering.ISpaPrerendererBuilder](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.ispaprerendererbuilder?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Prerendering,JavaScriptModuleExport](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.javascriptmoduleexport?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Prerendering.Prerenderer](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.prerenderer?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Prerendering.PrerenderTagHelper](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.prerendertaghelper?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Prerendering.RenderToStringResult](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.prerendering.rendertostringresult?view=aspnetcore-2.2)
- [Microsoft.AspNetCore.SpaServices.Webpack.WebpackDevMiddlewareOptions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.spaservices.webpack.webpackdevmiddlewareoptions?view=aspnetcore-2.2)

- [Microsoft.Extensions.DependencyInjection.NodeServicesServiceCollectionExtensions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.nodeservicesservicecollectionextensions?view=aspnetcore-2.2)
- [Microsoft.Extensions.DependencyInjection.PrerenderingServiceCollectionExtensions](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.prerenderingservicecollectionextensions?view=aspnetcore-2.2)



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#### Issue metadata

* Issue type: breaking-change

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Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices now obsolete #14958