Provide with_cloneable to simplify passing shared services to routes

[andyHa]

Passing shared services to routes is a very common task. Most of the time these implement Clone
as they're most probably wrapped as Arc anyway. Using with_cloneable is a bit shorter and
more concise than crate::any().map(move || value.clone()).

[seanmonstar]

Sorry, I hadn't been paying attention to the notifications here, I was way too busy with other things. I've finally gotten back to fixing up warp some.

I appreciate the goal here, and I admit I'm slightly torn. On the one hand, since warp::any().map(move || val.clone()) works, I kind of like it being the "one way". But I recognize it requires understanding several concepts that are somewhat unrelated to just "give me clones of this thing".

If I did merge something like this, I think I'd lean towards a different name. Possibly warp::cloned(val), maybe something else fluid like that. The term with is already used for wrapping filters, and cloneable is closer to Java-speak than Rust normally is. Anyways, that's my thoughts 🫣