Add developer exception page middleware to the web api templates

[danroth27]

We should add developer exception page middleware to the web API templates so that you get some diagnostic error information in the response when there is a 500 in development.

[mlorbetske]

Is this just adding

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

to the WebAPI templates' Startup.cs?

[danroth27]

Yes, and the necessary nuget package when running on the .NET Framework.

[mlorbetske]

Do you know offhand which package that is? Things seem to be working without updating the packages

[danroth27]

Microsoft.AspNetCore.Diagnostics

[mlorbetske]

Sweet, this seems to be getting pulled in via the Microsoft.AspNetCore package, so I think we're good