Do not require to implement own BaseLinkHelper

[andresmoschini]

Currently it is required to register a custom version of ILinkHelper in startup.

Maybe it is possible to configure AspNet.HypermediaApi Linking with a helper, something like:

public void ConfigureServices(IServiceCollection services)
{
    services.AddHypermediaApi(new AddHypermediaApiOptions() {
        GenerateToHomeAccountLink = (linkHelper, httpContext) => {
            var username = httpContext?.User?.Identity?.Name;
            return
                username == null ? linkHelper.ToAction<HomeController>(x => x.AccountHome(TemplateParameter.Create<string>()))
                : linkHelper.ToAction<HomeController>(x => x.AccountHome(username));
        }
    });