Add generic overload/extension method for MvcOptions.Filters.AddService<FilterType>

[DamianEdwards]

We should add an extension method to MvcOptions.Fiters that allows adding a service-based filter type via a generic argument, e.g.:

services.AddMvc(options =>
        {
            options.Filters.AddService<RequireLoginFilter>();
        });

@rynowak @davidfowl

[Eilon]

Basically a convenience version of this: https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNetCore.Mvc.Core/Filters/FilterCollection.cs#L73

Should add:

1. Add<TFilterType>()
2. Add<TFilterType>(int order)
3. AddService<TFilterType>()
4. AddService<TFilterType>(int order)

[rynowak]

Also related https://github.com/aspnet/Mvc/issues/6161

[rynowak]

@jbagga - looks like we got a PR for this that will satisfy the requirements, so no need for you to take action here

[rynowak]

7166dfe

[rynowak]

Thanks @henkmollema