Di/partials location formats/async writing

[MoazAlkharfan]

• Use FluidViewEngineOptions.PartialsLocationFormats to lookup partials files

  • https://github.com/sebastienros/fluid/blob/5067057abc854e0026bfc214dbfd467776a9d60c/Fluid.ViewEngine/FluidViewRenderer.cs#L284-L307

• Use DI for FluidViewRenderer to allow for overriding

  • https://github.com/sebastienros/fluid/blob/5067057abc854e0026bfc214dbfd467776a9d60c/Fluid.MvcViewEngine/MvcViewFeaturesMvcBuilderExtensions.cs#L27-L31

• Configure for FluidMvcViewOptions to have consistent options values across the inheritance hierarchy

  • https://github.com/sebastienros/fluid/blob/7032077df1fb3cf7b6a4acfa22222a7612271452/Fluid.MvcViewEngine/MvcViewFeaturesMvcBuilderExtensions.cs#L19-L26

services
       .AddControllersWithViews()
       .AddFluid(options => {
              /// ... Anything using FluidMvcViewOptions doesn't work with the configuration set here

              /// Options need to be repeated
       });

// Need this to set mvc options
services
       .Configure<FluidMvcViewOptions>(x =>
       {
              /// Before:
              /// Options need to be repeated here

              /// After:
              // Only this is needed to be configured
              x.RenderingViewAsync = (path, viewContext, context) =>
              {
                     return ValueTask.CompletedTask;
              };
       });

• Add WriteToAsync because otherwise kestrel would throw and requires to override AllowSynchronousIO

builder.WebHost
        .UseKestrel(p =>
        {
            p.AllowSynchronousIO = true;
        });