Overhaul async hooks: use_future, use_coroutine, use_effect (new)

[jkelleyrtp]

This PR overhauls

• use_future to include a dependency array through some very clever rust trait magic (!)
• use_coroutine to be designed explicitly for long-running async tasks
• use_effect as a flavor of use_future that doesn't cause re-renders

[jkelleyrtp]

Here we goooooo