Move IQueryAttributable outside of MAUI

[michaelstonis]

IQueryAttributable is a pretty cool, and underutilized, interface that allows us to pass data when routing to Pages and their view models. This can make it very easy to provide context without having to do constructor injection or anything fun like that. The only issue with this is that IQueryAttributable is owned by the MAUI libraries which results in view models always having a hard dependency on it. It would be great if this could somehow be abstracted away or moved to a separate, more generic, place that would not require this dependency. I could see this being helpful for other UI platforms like Blazor, Avalonia, Uno, etc.