Feature request: Run analyzers in debug mode

Problem motivation: #18768, app.UseSpa was in the wrong order.

Add app.UseRunAllAnalyzers to template code to detect middleware order and other problems.

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
        app.UseDatabaseErrorPage();
        app.UseRunAllAnalyzers();   // run middleware order check and other checks
    }
    else
    {
        app.UseExceptionHandler("/Error");
        app.UseHsts();
    }

    ...

UseRunAllAnalyzers could be updated frequently to add more checks.

See https://twitter.com/davidfowl/status/1228902288627912705 where @davidfowl requests this.

cc @javiercn

[javiercn]

@Rick-Anderson thanks for following up.

@mkArtakMSFT I’m moving this to next milestone planning so that we can look at it then and decide.

[Rick-Anderson]

Here’s another Order of UseStatusCodePagesWithReExecute and UseRouting shouldn’t matter #19374