Add timeout wrapper for any callback interface

[marcooliveira]

This solves #429 (comment).

Enables timing out a callback interface by wrapping the function and preventing it from being called after it has timed out.

[oshybystyi]

vote for that 👍

[aearly]

You can reopen this if you resolve the merge conflicts. Also, the docs don't give a clear example of how this can be used. Do you wrap the callback, or the whole async function?