Address effect debounce sendability

[qwerty3345]

Address effect cancellation sendability #3326
Address Effect.throttle sendability #3325
I see that you are working on similar tasks in the above PRs.
It seems likely that effect cancellation sendability is processed, these PR will be affected as well.

I apologise if this PR has caused any inconvenience to your flow that you are already working on (you can just close it).
I sent the PR because I wanted to make a small contribution to the community.

Thank you.

[stephencelis]

@qwerty3345 Thanks for taking the time to PR! We actually don't think this API needs the sendable constraint, though, and there are no warnings in it currently. The throttle API requires sendable actions because it captures them to emit later, but debounce does not have this same requirement. So I think we'll keep things as is, but thanks all the same for taking the time.