co_yield support for IIterable<T>

[jaigak]

Provide the ability to generate a WinRT iterator object by using C++ coroutines.

By the way, please add an issue template for feature requests.

[sylveon]

This is something on my radar. If nobody's a taker I can look into it.

[github-actions]

This issue is stale because it has been open 10 days with no activity. Remove stale label or comment or this will be closed in 5 days.