Feature request: timeout option for submit()

[tavoyne]

In my app, I'm submitting a Form as the user types (auto-saving feature). It'd be great if we could specify a timeout when submit()ing (➡️ a subsequent submit() would cancel the previous one if still pending). What I'm doing right now is that I created my own abstraction for this, and it works just fine, however I'm loosing all the goodies such as useNavigation(), for which I also have to create an abstraction in order to be able to track that new "timed-out" state. It'd be so great to have this integrated directly into Remix.