Add an option allowing to configure the scheme/display name associated with the Windows scheme

[kevinchalet]

IISMiddleware registers the Windows scheme using the hardcoded null display name. Yet, there are cases where you want to specify a display name so the scheme appears in the external schemes list.

Please add an option to make the display name configurable (and maybe the scheme name too).

https://github.com/aspnet/IISIntegration/blob/dev/src/Microsoft.AspNetCore.Server.IISIntegration/IISMiddleware.cs#L60

Note: this also applies to WebListener.

/cc @Tratcher @HaoK

[kevinchalet]

@Tratcher not having this option will be blocking for me for at least 3 projects. Is it too late to send a PR adding a DisplayName property to IISOptions? (and optionally, an AuthenticationScheme property)

[Tratcher]

If you're blocked go ahead and send the PR. We'll see if we can get it approved.

[Tratcher]

rel/2.0.0 branch

[kevinchalet]

Okay, will do that tonight.

[Tratcher]

Tentatively approved, I'll do the PR today.